diff --git a/Python/pymath.c b/Python/pymath.c
index eb06eb2244b..a5c0dd94148 100644
--- a/Python/pymath.c
+++ b/Python/pymath.c
@@ -57,7 +57,7 @@ double hypot(double x, double y)
 #endif /* HAVE_HYPOT */
 
 #ifndef HAVE_COPYSIGN
-static double
+double
 copysign(double x, double y)
 {
 	/* use atan2 to distinguish -0. from 0. */