diff --git a/src/app-layer-detect-proto.c b/src/app-layer-detect-proto.c
index 7e951cf854..d15fa5eb50 100644
--- a/src/app-layer-detect-proto.c
+++ b/src/app-layer-detect-proto.c
@@ -1661,6 +1661,8 @@ int AppLayerProtoDetectDeSetup(void)
                 sig = pm_ctx->map[id];
                 AppLayerProtoDetectPMFreeSignature(sig);
             }
+            SCFree(pm_ctx->map);
+            pm_ctx->map = NULL;
         }
     }