diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.inc.c
similarity index 100%
rename from fpu/softfloat-specialize.h
rename to fpu/softfloat-specialize.inc.c
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 7ef0638d7e..0638c9f4e0 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -634,7 +634,7 @@ static inline float64 float64_pack_raw(FloatParts p)
 | are propagated from function inputs to output.  These details are target-
 | specific.
 *----------------------------------------------------------------------------*/
-#include "softfloat-specialize.h"
+#include "softfloat-specialize.inc.c"
 
 /* Canonicalize EXP and FRAC, setting CLS.  */
 static FloatParts sf_canonicalize(FloatParts part, const FloatFmt *parm,