diff --git a/dlls/crtdll/crtdll.spec b/dlls/crtdll/crtdll.spec
index d5192ad7569..c66cea5bade 100644
--- a/dlls/crtdll/crtdll.spec
+++ b/dlls/crtdll/crtdll.spec
@@ -64,7 +64,7 @@
 @ extern _commode_dll MSVCRT__commode
 @ cdecl _control87(long long)
 @ cdecl _controlfp(long long)
-@ cdecl _copysign(double double)
+@ cdecl _copysign(double double) copysign
 @ varargs _cprintf(str)
 @ extern _cpumode_dll CRTDLL__cpumode_dll
 @ cdecl _cputs(str)
diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index 3e2839b3908..a42fe349cf5 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -733,8 +733,8 @@
 @ cdecl _control87(long long)
 @ cdecl _controlfp(long long)
 @ cdecl _controlfp_s(ptr long long)
-@ cdecl _copysign(double double)
-@ cdecl -arch=!i386 _copysignf(float float)
+@ cdecl _copysign(double double) copysign
+@ cdecl -arch=!i386 _copysignf(float float) copysignf
 @ varargs _cprintf(str)
 @ stub _cprintf_l
 @ stub _cprintf_p
diff --git a/dlls/msvcr110/msvcr110.spec b/dlls/msvcr110/msvcr110.spec
index c23293ea658..2bccd8c6fe9 100644
--- a/dlls/msvcr110/msvcr110.spec
+++ b/dlls/msvcr110/msvcr110.spec
@@ -1081,8 +1081,8 @@
 @ cdecl _control87(long long)
 @ cdecl _controlfp(long long)
 @ cdecl _controlfp_s(ptr long long)
-@ cdecl _copysign(double double)
-@ cdecl -arch=!i386 _copysignf(float float)
+@ cdecl _copysign(double double) copysign
+@ cdecl -arch=!i386 _copysignf(float float) copysignf
 @ varargs _cprintf(str)
 @ stub _cprintf_l
 @ stub _cprintf_p
diff --git a/dlls/msvcr120/msvcr120.spec b/dlls/msvcr120/msvcr120.spec
index 6eac1937227..ed0f69b49bc 100644
--- a/dlls/msvcr120/msvcr120.spec
+++ b/dlls/msvcr120/msvcr120.spec
@@ -1073,8 +1073,8 @@
 @ cdecl _control87(long long)
 @ cdecl _controlfp(long long)
 @ cdecl _controlfp_s(ptr long long)
-@ cdecl _copysign(double double)
-@ cdecl _copysignf(float float)
+@ cdecl _copysign(double double) copysign
+@ cdecl _copysignf(float float) copysignf
 @ varargs _cprintf(str)
 @ stub _cprintf_l
 @ stub _cprintf_p
@@ -2091,9 +2091,9 @@
 @ stub conj
 @ stub conjf
 @ stub conjl
-@ cdecl copysign(double double) _copysign
-@ cdecl copysignf(float float) _copysignf
-@ cdecl copysignl(double double) _copysign
+@ cdecl copysign(double double)
+@ cdecl copysignf(float float)
+@ cdecl copysignl(double double) copysign
 @ cdecl cos(double)
 @ cdecl -arch=!i386 cosf(float)
 @ cdecl cosh(double)
diff --git a/dlls/msvcr70/msvcr70.spec b/dlls/msvcr70/msvcr70.spec
index 60fa9ed8693..cb3a92cf395 100644
--- a/dlls/msvcr70/msvcr70.spec
+++ b/dlls/msvcr70/msvcr70.spec
@@ -258,7 +258,7 @@
 @ extern _commode MSVCRT__commode
 @ cdecl _control87(long long)
 @ cdecl _controlfp(long long)
-@ cdecl _copysign(double double)
+@ cdecl _copysign(double double) copysign
 @ varargs _cprintf(str)
 @ cdecl _cputs(str)
 @ cdecl _cputws(wstr)
diff --git a/dlls/msvcr71/msvcr71.spec b/dlls/msvcr71/msvcr71.spec
index 1aacd768d46..a559b5cc376 100644
--- a/dlls/msvcr71/msvcr71.spec
+++ b/dlls/msvcr71/msvcr71.spec
@@ -253,7 +253,7 @@
 @ extern _commode MSVCRT__commode
 @ cdecl _control87(long long)
 @ cdecl _controlfp(long long)
-@ cdecl _copysign(double double)
+@ cdecl _copysign(double double) copysign
 @ varargs _cprintf(str)
 @ cdecl _cputs(str)
 @ cdecl _cputws(wstr)
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index cf885153e7a..06d0bdf82cd 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -397,8 +397,8 @@
 @ cdecl _control87(long long)
 @ cdecl _controlfp(long long)
 @ cdecl _controlfp_s(ptr long long)
-@ cdecl _copysign(double double)
-@ cdecl -arch=!i386 _copysignf(float float)
+@ cdecl _copysign(double double) copysign
+@ cdecl -arch=!i386 _copysignf(float float) copysignf
 @ varargs _cprintf(str)
 @ stub _cprintf_l
 @ stub _cprintf_p
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index 87b31d1a048..d020de98a02 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -380,8 +380,8 @@
 @ cdecl _control87(long long)
 @ cdecl _controlfp(long long)
 @ cdecl _controlfp_s(ptr long long)
-@ cdecl _copysign(double double)
-@ cdecl -arch=!i386 _copysignf(float float)
+@ cdecl _copysign(double double) copysign
+@ cdecl -arch=!i386 _copysignf(float float) copysignf
 @ varargs _cprintf(str)
 @ stub _cprintf_l
 @ stub _cprintf_p
diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index 6dcd9b5ec5f..c0d9baab361 100644
--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -216,19 +216,6 @@ float CDECL _chgsignf( float num )
     return u.f;
 }
 
-/*********************************************************************
- *      _copysignf (MSVCRT.@)
- *
- * Copied from musl: src/math/copysignf.c
- */
-float CDECL _copysignf( float x, float y )
-{
-    union { float f; UINT32 i; } ux = { x }, uy = { y };
-    ux.i &= 0x7fffffff;
-    ux.i |= uy.i & 0x80000000;
-    return ux.f;
-}
-
 /*********************************************************************
  *      _nextafterf (MSVCRT.@)
  *
@@ -5723,19 +5710,6 @@ int CDECL fesetround(int round_mode)
 
 #endif /* _MSVCR_VER>=120 */
 
-/*********************************************************************
- *		_copysign (MSVCRT.@)
- *
- * Copied from musl: src/math/copysign.c
- */
-double CDECL _copysign( double x, double y )
-{
-    union { double f; UINT64 i; } ux = { x }, uy = { y };
-    ux.i &= ~0ull >> 1;
-    ux.i |= uy.i & 1ull << 63;
-    return ux.f;
-}
-
 /*********************************************************************
  *		_finite (MSVCRT.@)
  */
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index 6dcb0767c31..43259d7abad 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -367,8 +367,8 @@
 @ cdecl _control87(long long)
 @ cdecl _controlfp(long long)
 @ cdecl _controlfp_s(ptr long long)
-@ cdecl _copysign(double double)
-@ cdecl -arch=!i386 _copysignf(float float)
+@ cdecl _copysign(double double) copysign
+@ cdecl -arch=!i386 _copysignf(float float) copysignf
 @ varargs _cprintf(str)
 # stub _cprintf_l(str ptr)
 # stub _cprintf_p(str)
diff --git a/dlls/msvcrtd/msvcrtd.spec b/dlls/msvcrtd/msvcrtd.spec
index 33696eba829..5cb09d92c74 100644
--- a/dlls/msvcrtd/msvcrtd.spec
+++ b/dlls/msvcrtd/msvcrtd.spec
@@ -242,7 +242,7 @@
 @ extern _commode MSVCRT__commode
 @ cdecl _control87(long long)
 @ cdecl _controlfp(long long)
-@ cdecl _copysign(double double)
+@ cdecl _copysign(double double) copysign
 @ varargs _cprintf(str)
 @ cdecl _cputs(str)
 @ cdecl _creat(str long)
diff --git a/dlls/ucrtbase/ucrtbase.spec b/dlls/ucrtbase/ucrtbase.spec
index bc9dd2bcbc6..87a266198bd 100644
--- a/dlls/ucrtbase/ucrtbase.spec
+++ b/dlls/ucrtbase/ucrtbase.spec
@@ -237,8 +237,8 @@
 @ cdecl _control87(long long)
 @ cdecl _controlfp(long long)
 @ cdecl _controlfp_s(ptr long long)
-@ cdecl _copysign(double double)
-@ cdecl _copysignf(float float)
+@ cdecl _copysign(double double) copysign
+@ cdecl _copysignf(float float) copysignf
 @ cdecl _cputs(str)
 @ cdecl _cputws(wstr)
 @ cdecl _creat(str long)
@@ -2236,9 +2236,9 @@
 @ stub conj
 @ stub conjf
 @ stub conjl
-@ cdecl copysign(double double) _copysign
-@ cdecl copysignf(float float) _copysignf
-@ cdecl copysignl(double double) _copysign
+@ cdecl copysign(double double)
+@ cdecl copysignf(float float)
+@ cdecl copysignl(double double) copysign
 @ cdecl cos(double)
 @ cdecl -arch=!i386 cosf(float)
 @ cdecl cosh(double)