diff --git a/src/ARM.cpp b/src/ARM.cpp
index 2fd7c2d41c..e24dc2ff3d 100644
--- a/src/ARM.cpp
+++ b/src/ARM.cpp
@@ -68,9 +68,9 @@ void ARM::GdbCheckC()
     else GdbCheckB();
 }
 #else
-ARM::GdbCheckA() {}
-ARM::GdbCheckB() {}
-ARM::GdbCheckC() {}
+void ARM::GdbCheckA() {}
+void ARM::GdbCheckB() {}
+void ARM::GdbCheckC() {}
 #endif