diff --git a/src/gui/editing.cpp b/src/gui/editing.cpp
index 817d9324d..dbad0d634 100644
--- a/src/gui/editing.cpp
+++ b/src/gui/editing.cpp
@@ -764,6 +764,8 @@ uint64_t convert_effect_openmpt_mod(char symbol, uint16_t val)
 
     default: return 0; break;
   }
+
+  return 0;
 }
 
 uint64_t convert_effect_openmpt_s3m(char symbol, uint16_t val)
@@ -950,6 +952,8 @@ uint64_t convert_effect_openmpt_s3m(char symbol, uint16_t val)
 
     default: return 0; break;
   }
+
+  return 0;
 }
 
 uint64_t convert_effect_openmpt_xm(char symbol, uint16_t val)