diff --git a/src/RemoteSerializer.cc b/src/RemoteSerializer.cc
index ebf7157a3a..b1e751d510 100644
--- a/src/RemoteSerializer.cc
+++ b/src/RemoteSerializer.cc
@@ -2724,7 +2724,7 @@ void RemoteSerializer::InternalCommError(const char* msg)
 #ifdef DEBUG_COMMUNICATION
 	DumpDebugData();
 #else
-	internal_error(msg);
+	internal_error("%s", msg);
 #endif
 	}
 
diff --git a/src/Sessions.cc b/src/Sessions.cc
index b29192a471..1cbbbb272e 100644
--- a/src/Sessions.cc
+++ b/src/Sessions.cc
@@ -1354,7 +1354,7 @@ void NetSessions::Internal(const char* msg, const struct pcap_pkthdr* hdr,
 				const u_char* pkt)
 	{
 	DumpPacket(hdr, pkt);
-	internal_error(msg);
+	internal_error("%s", msg);
 	}
 
 void NetSessions::Weird(const char* name,