diff --git a/src/math/signgam.c b/src/math/signgam.c
index 12cc32d7..b39ceb04 100644
--- a/src/math/signgam.c
+++ b/src/math/signgam.c
@@ -1,2 +1,5 @@
-#include <math.h>
-int signgam = 0;
+#include "libm.h"
+
+int __signgam = 0;
+
+weak_alias(__signgam, signgam);