diff --git a/src/detect-engine.c b/src/detect-engine.c
index b1f06cc0b5..be0a15e854 100644
--- a/src/detect-engine.c
+++ b/src/detect-engine.c
@@ -102,13 +102,7 @@ static uint32_t DetectEngineTentantGetIdFromPcap(const void *ctx, const Packet *
 static DetectEngineAppInspectionEngine *g_app_inspect_engines = NULL;
 
 void DetectAppLayerInspectEngineRegister(AppProto alproto,
-        uint32_t dir, int32_t sm_list,
-        int (*Callback)(ThreadVars *tv,
-            DetectEngineCtx *de_ctx,
-            DetectEngineThreadCtx *det_ctx,
-            const Signature *sig, Flow *f,
-            uint8_t flags, void *alstate,
-            void *tx, uint64_t tx_id))
+        uint32_t dir, int32_t sm_list, InspectEngineFuncPtr Callback)
 {
     if ((alproto >= ALPROTO_FAILED) ||
         (!(dir == SIG_FLAG_TOSERVER || dir == SIG_FLAG_TOCLIENT)) ||
diff --git a/src/detect-engine.h b/src/detect-engine.h
index 498dd22d8a..935a3d79e3 100644
--- a/src/detect-engine.h
+++ b/src/detect-engine.h
@@ -84,14 +84,7 @@ int DetectEngineInspectGenericList(ThreadVars *, const DetectEngineCtx *,
  * \param Callback The engine callback.
  */
 void DetectAppLayerInspectEngineRegister(AppProto alproto,
-                                 uint32_t dir,
-                                 int32_t sm_list,
-                                 int (*Callback)(ThreadVars *tv,
-                                     DetectEngineCtx *de_ctx,
-                                     DetectEngineThreadCtx *det_ctx,
-                                     const Signature *sig, Flow *f,
-                                     uint8_t flags, void *alstate,
-                                     void *tx, uint64_t tx_id));
+        uint32_t dir, int32_t sm_list, InspectEngineFuncPtr Callback);
 
 int DetectEngineAppInspectionEngine2Signature(Signature *s);
 
diff --git a/src/detect.h b/src/detect.h
index 66951f6a52..72280b6ead 100644
--- a/src/detect.h
+++ b/src/detect.h
@@ -375,6 +375,11 @@ typedef struct SigMatchData_ {
 
 struct DetectEngineThreadCtx_;// DetectEngineThreadCtx;
 
+typedef int (*InspectEngineFuncPtr)(ThreadVars *tv,
+        struct DetectEngineCtx_ *de_ctx, struct DetectEngineThreadCtx_ *det_ctx,
+        const struct Signature_ *sig, Flow *f, uint8_t flags, void *alstate,
+        void *tx, uint64_t tx_id);
+
 typedef struct DetectEngineAppInspectionEngine_ {
     AppProto alproto;
     uint8_t dir;
@@ -387,10 +392,7 @@ typedef struct DetectEngineAppInspectionEngine_ {
      *         3 Special value used by filestore sigs to indicate disabling
      *           filestore for the tx.
      */
-    int (*Callback)(ThreadVars *tv,
-                    struct DetectEngineCtx_ *de_ctx, struct DetectEngineThreadCtx_ *det_ctx,
-                    const struct Signature_ *sig, Flow *f, uint8_t flags, void *alstate,
-                    void *tx, uint64_t tx_id);
+    InspectEngineFuncPtr Callback;
 
     struct DetectEngineAppInspectionEngine_ *next;
 } DetectEngineAppInspectionEngine;