diff --git a/src/include/defines.h b/src/include/defines.h
index d1e0e071e..6e3a8a1c4 100644
--- a/src/include/defines.h
+++ b/src/include/defines.h
@@ -112,7 +112,7 @@
 
 
 #ifndef SIGNAL_FUNCTION
-#if defined(_MSC_VER) || defined(__MINGW32__) || defined(__CYGWIN__)
+#if defined(_MSC_VER) || defined(__MINGW32__) || defined(__CYGWIN__) || defined(__SUNPRO_C)
 #  define SIGNAL_FUNCTION RETSIGTYPE (*)(int)
 #else
 #  define SIGNAL_FUNCTION sighandler_t