diff --git a/src/app-layer-dns-common.c b/src/app-layer-dns-common.c
index cb5ce14ef8..7c5f3f672b 100644
--- a/src/app-layer-dns-common.c
+++ b/src/app-layer-dns-common.c
@@ -155,7 +155,7 @@ void DNSSetEvent(DNSState *s, uint8_t e) {
 /** \internal
  *  \brief Allocate a DNS TX
  *  \retval tx or NULL */
-DNSTransaction *DNSTransactionAlloc(const uint16_t tx_id) {
+static DNSTransaction *DNSTransactionAlloc(const uint16_t tx_id) {
     DNSTransaction *tx = SCMalloc(sizeof(DNSTransaction));
     if (unlikely(tx == NULL))
         return NULL;
diff --git a/src/app-layer-dns-common.h b/src/app-layer-dns-common.h
index 5886aca7aa..15a3554991 100644
--- a/src/app-layer-dns-common.h
+++ b/src/app-layer-dns-common.h
@@ -177,7 +177,6 @@ uint64_t DNSGetTxCnt(void *alstate);
 int DNSGetAlstateProgress(void *tx, uint8_t direction);
 int DNSGetAlstateProgressCompletionStatus(uint8_t direction);
 
-DNSTransaction *DNSTransactionAlloc(const uint16_t tx_id);
 void DNSStateTransactionFree(void *state, uint64_t tx_id);
 DNSTransaction *DNSTransactionFindByTxId(const DNSState *dns_state, const uint16_t tx_id);