diff --git a/src/load-signal.c b/src/load-signal.c
index 1eeb3b6..9a1fe1e 100644
--- a/src/load-signal.c
+++ b/src/load-signal.c
@@ -41,6 +41,8 @@
 #   define SIG_T sighandler_t
 #elif defined HAVE_SIG_T
 #   define SIG_T sig_t
+#else
+    typedef void (*SIG_T) (int);
 #endif
 
 /* Library functions that we divert */