diff --git a/libsrc/dbg/dbg.c b/libsrc/dbg/dbg.c
index 32a0cfba0..e6d8c5c88 100644
--- a/libsrc/dbg/dbg.c
+++ b/libsrc/dbg/dbg.c
@@ -518,6 +518,10 @@ static char IsAbortKey (char C)
     if (C == CH_STOP) {
         return 1;
     }
+#endif
+#if !defined(CH_ESC) && !defined(CH_STOP)
+    /* Avoid compiler warning about unused parameter */
+    (void) C;
 #endif
     return 0;
 }