diff --git a/sys/arm/include/signal.h b/sys/arm/include/signal.h
index 21700821695..4b6fa37b224 100644
--- a/sys/arm/include/signal.h
+++ b/sys/arm/include/signal.h
@@ -42,6 +42,7 @@ typedef	long sig_atomic_t;
 #if __BSD_VISIBLE
 
 struct sigcontext {
+	int _dummy;
 };
 
 #endif