diff --git a/src/detect-engine-mpm.c b/src/detect-engine-mpm.c
index 3460b39172..9301541c2a 100644
--- a/src/detect-engine-mpm.c
+++ b/src/detect-engine-mpm.c
@@ -97,9 +97,6 @@ typedef struct AppLayerMpms_ {
 } AppLayerMpms;
 
 AppLayerMpms app_mpms[] = {
-    { "http_user_agent", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_HUADMATCH,
-        PrefilterTxUARegister, 0},
-
     { "http_raw_header", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_HRHDMATCH,
         PrefilterTxRequestHeadersRawRegister, 0},
     { "http_raw_header", 0, SIG_FLAG_TOCLIENT, DETECT_SM_LIST_HRHDMATCH,
diff --git a/src/detect-http-ua.c b/src/detect-http-ua.c
index b923c43fda..2042ee8d77 100644
--- a/src/detect-http-ua.c
+++ b/src/detect-http-ua.c
@@ -57,6 +57,7 @@
 #include "app-layer-htp.h"
 #include "stream-tcp.h"
 #include "detect-http-ua.h"
+#include "detect-engine-hua.h"
 
 int DetectHttpUASetup(DetectEngineCtx *, Signature *, char *);
 void DetectHttpUARegisterTests(void);
@@ -79,6 +80,10 @@ void DetectHttpUARegister(void)
     sigmatch_table[DETECT_AL_HTTP_USER_AGENT].flags |= SIGMATCH_NOOPT;
     sigmatch_table[DETECT_AL_HTTP_USER_AGENT].flags |= SIGMATCH_PAYLOAD ;
 
+    DetectMpmAppLayerRegister("http_user_agent", SIG_FLAG_TOSERVER,
+            DETECT_SM_LIST_HUADMATCH,
+            PrefilterTxUARegister);
+
     return;
 }