diff --git a/dlls/api-ms-win-crt-private-l1-1-0/api-ms-win-crt-private-l1-1-0.spec b/dlls/api-ms-win-crt-private-l1-1-0/api-ms-win-crt-private-l1-1-0.spec
index 7e2717c44ab..668b8c02fbe 100644
--- a/dlls/api-ms-win-crt-private-l1-1-0/api-ms-win-crt-private-l1-1-0.spec
+++ b/dlls/api-ms-win-crt-private-l1-1-0/api-ms-win-crt-private-l1-1-0.spec
@@ -957,8 +957,8 @@
 @ stub _o_fma
 @ stub _o_fmaf
 @ stub _o_fmal
-@ stub _o_fmod
-@ stub _o_fmodf
+@ cdecl _o_fmod(double double) ucrtbase._o_fmod
+@ cdecl -arch=!i386 _o_fmodf(float float) ucrtbase._o_fmodf
 @ stub _o_fopen
 @ stub _o_fopen_s
 @ stub _o_fputc
diff --git a/dlls/ucrtbase/ucrtbase.spec b/dlls/ucrtbase/ucrtbase.spec
index 8987134d97f..dc95824a1f5 100644
--- a/dlls/ucrtbase/ucrtbase.spec
+++ b/dlls/ucrtbase/ucrtbase.spec
@@ -1621,8 +1621,8 @@
 @ stub _o_fma
 @ stub _o_fmaf
 @ stub _o_fmal
-@ stub _o_fmod
-@ stub _o_fmodf
+@ cdecl _o_fmod(double double) MSVCRT_fmod
+@ cdecl -arch=!i386 _o_fmodf(float float) MSVCRT_fmodf
 @ stub _o_fopen
 @ stub _o_fopen_s
 @ stub _o_fputc