diff --git a/src/detect.h b/src/detect.h
index 3d90519b73..71cdc458b0 100644
--- a/src/detect.h
+++ b/src/detect.h
@@ -1189,6 +1189,7 @@ typedef struct SigTableElmt_ {
 
     /** InspectionBuffer transformation callback */
     void (*Transform)(InspectionBuffer *, void *context);
+    bool (*TransformValidate)(const uint8_t *content, uint16_t content_len, void *context);
 
     /** keyword setup function pointer */
     int (*Setup)(DetectEngineCtx *, Signature *, const char *);