diff --git a/src/app-layer-events.h b/src/app-layer-events.h
index 40bda72abf4d..d66191e1cdd1 100644
--- a/src/app-layer-events.h
+++ b/src/app-layer-events.h
@@ -74,8 +74,6 @@ static inline int AppLayerDecoderEventsIsEventSet(
     return 0;
 }
 
-void AppLayerDecoderEventsResetEvents(AppLayerDecoderEvents *events);
-void AppLayerDecoderEventsFreeEvents(AppLayerDecoderEvents **events);
 int DetectEngineGetEventInfo(const char *event_name, int *event_id, AppLayerEventType *event_type);
 
 #endif /* SURICATA_APP_LAYER_EVENTS_H */
diff --git a/src/detect-engine-mpm.h b/src/detect-engine-mpm.h
index f11b7e231eab..16195414042b 100644
--- a/src/detect-engine-mpm.h
+++ b/src/detect-engine-mpm.h
@@ -48,9 +48,6 @@ void PatternMatchThreadDestroy(MpmThreadCtx *mpm_thread_ctx, uint16_t);
 
 int PatternMatchPrepareGroup(DetectEngineCtx *, SigGroupHead *);
 
-TmEcode DetectEngineThreadCtxInit(ThreadVars *, void *, void **);
-TmEcode DetectEngineThreadCtxDeinit(ThreadVars *, void *);
-
 int SignatureHasPacketContent(const Signature *);
 int SignatureHasStreamContent(const Signature *);
 
diff --git a/src/detect-engine.c b/src/detect-engine.c
index 6dec58b8fa2f..c34c305d4a15 100644
--- a/src/detect-engine.c
+++ b/src/detect-engine.c
@@ -63,6 +63,8 @@
 
 #include "detect-engine-loader.h"
 
+#include "detect-engine-alert.h"
+
 #include "util-classification-config.h"
 #include "util-reference-config.h"
 #include "util-threshold-config.h"
diff --git a/src/detect-engine.h b/src/detect-engine.h
index 11d747537f1e..3552f161399e 100644
--- a/src/detect-engine.h
+++ b/src/detect-engine.h
@@ -74,7 +74,6 @@ bool DetectEngineBufferTypeSupportsMultiInstanceGetById(
         const DetectEngineCtx *de_ctx, const int id);
 bool DetectEngineBufferTypeSupportsFramesGetById(const DetectEngineCtx *de_ctx, const int id);
 const char *DetectEngineBufferTypeGetDescriptionById(const DetectEngineCtx *de_ctx, const int id);
-const DetectBufferType *DetectEngineBufferTypeGetById(const DetectEngineCtx *de_ctx, const int id);
 int DetectEngineBufferTypeGetByIdTransforms(
         DetectEngineCtx *de_ctx, const int id, TransformData *transforms, int transform_cnt);
 void DetectEngineBufferRunSetupCallback(const DetectEngineCtx *de_ctx, const int id, Signature *s);
diff --git a/src/detect-http-header.h b/src/detect-http-header.h
index 187b82736430..a1c9a1396a4a 100644
--- a/src/detect-http-header.h
+++ b/src/detect-http-header.h
@@ -25,7 +25,6 @@
 #define SURICATA_DETECT_HTTP_HEADER_H
 
 void DetectHttpHeaderRegister(void);
-void DetectHttpRawHeaderRegister(void);
 void DetectHttpRequestHeaderRegister(void);
 void DetectHttpResponseHeaderRegister(void);
 
diff --git a/src/detect.h b/src/detect.h
index 9a41669d7f12..44b277ed541f 100644
--- a/src/detect.h
+++ b/src/detect.h
@@ -1594,8 +1594,6 @@ void *DetectGetInnerTx(void *tx_ptr, AppProto alproto, AppProto engine_alproto,
 void RuleMatchCandidateTxArrayInit(DetectEngineThreadCtx *det_ctx, uint32_t size);
 void RuleMatchCandidateTxArrayFree(DetectEngineThreadCtx *det_ctx);
 
-void AlertQueueInit(DetectEngineThreadCtx *det_ctx);
-void AlertQueueFree(DetectEngineThreadCtx *det_ctx);
 void AlertQueueAppend(DetectEngineThreadCtx *det_ctx, const Signature *s, Packet *p, uint64_t tx_id,
         uint8_t alert_flags);
 
diff --git a/src/flow-manager.c b/src/flow-manager.c
index ae60849a84bb..05b791ee612e 100644
--- a/src/flow-manager.c
+++ b/src/flow-manager.c
@@ -41,6 +41,7 @@
 #include "flow-spare-pool.h"
 
 #include "stream-tcp.h"
+#include "stream-tcp-cache.h"
 
 #include "util-device.h"
 
diff --git a/src/stream-tcp.h b/src/stream-tcp.h
index 006cbb5aa16e..402cdcfded7d 100644
--- a/src/stream-tcp.h
+++ b/src/stream-tcp.h
@@ -121,7 +121,6 @@ int StreamTcpSetMemcap(uint64_t);
 uint64_t StreamTcpGetMemcap(void);
 int StreamTcpCheckMemcap(uint64_t);
 uint64_t StreamTcpMemuseCounter(void);
-uint64_t StreamTcpReassembleMemuseGlobalCounter(void);
 
 int StreamTcpSegmentForEach(const Packet *p, uint8_t flag,
                         StreamSegmentCallback CallbackFunc,
@@ -205,7 +204,4 @@ void StreamTcpUpdateAppLayerProgress(TcpSession *ssn, char direction,
 uint64_t StreamTcpGetUsable(const TcpStream *stream, const bool eof);
 uint64_t StreamDataRightEdge(const TcpStream *stream, const bool eof);
 
-void StreamTcpThreadCacheEnable(void);
-void StreamTcpThreadCacheCleanup(void);
-
 #endif /* SURICATA_STREAM_TCP_H */
diff --git a/src/suricata.h b/src/suricata.h
index f5cc7ff4b4d6..70393541f6fc 100644
--- a/src/suricata.h
+++ b/src/suricata.h
@@ -185,7 +185,6 @@ int RunmodeIsUnittests(void);
 #else
 #define RunmodeIsUnittests() 0
 #endif
-int SCRunmodeGet(void);
 
 /**
  * \brief Get the current run mode.
diff --git a/src/util-profiling.h b/src/util-profiling.h
index 094c6de6d209..468012df6086 100644
--- a/src/util-profiling.h
+++ b/src/util-profiling.h
@@ -392,12 +392,6 @@ typedef struct SCProfileDetectCtx_ {
     pthread_mutex_t data_m;
 } SCProfileDetectCtx;
 
-void SCProfilingRulesGlobalInit(void);
-void SCProfilingRuleDestroyCtx(struct SCProfileDetectCtx_ *);
-void SCProfilingRuleInitCounters(DetectEngineCtx *);
-void SCProfilingRuleUpdateCounter(DetectEngineThreadCtx *, uint16_t, uint64_t, int);
-void SCProfilingRuleThreadSetup(struct SCProfileDetectCtx_ *, DetectEngineThreadCtx *);
-void SCProfilingRuleThreadCleanup(DetectEngineThreadCtx *);
 int SCProfileRuleStart(Packet *p);
 json_t *SCProfileRuleTriggerDump(DetectEngineCtx *de_ctx);
 void SCProfileRuleStartCollection(void);