1 files changed, 1 insertions, 1 deletions
diff --git a/math.c b/math.c
index e9e1678dc6..2eb95dcd10 100644
--- a/math.c
+++ b/math.c
@@ -14,7 +14,7 @@
 #include <math.h>
 #include <errno.h>
 
-#if defined(HAVE_SIGNBIT) && defined(__GNUC__) && defined(__sun__) && \
+#if defined(HAVE_SIGNBIT) && defined(__GNUC__) && defined(__sun) && \
     !defined(signbit)
     extern int signbit(double);
 #endif