diff --git a/src/preprocessors/Stream5/snort_stream5_session.c b/src/preprocessors/Stream5/snort_stream5_session.c
index 9b756fd..8b945f9 100644
--- a/src/preprocessors/Stream5/snort_stream5_session.c
+++ b/src/preprocessors/Stream5/snort_stream5_session.c
@@ -107,7 +107,7 @@ int GetLWSessionKeyFromIpPort(
                     uint16_t srcPort,
                     snort_ip_p dstIP,
                     uint16_t dstPort,
-                    char proto,
+                    uint8_t proto,
                     uint16_t vlan,
                     uint32_t mplsId,
                     uint16_t addressSpaceId,
@@ -310,7 +310,7 @@ int GetLWSessionKeyFromIpPort(
 
 int GetLWSessionKey(Packet *p, SessionKey *key)
 {
-    char proto = GET_IPH_PROTO(p);
+    uint8_t proto = GET_IPH_PROTO(p);
     uint32_t mplsId = 0;
     uint16_t vlanId = 0;
     uint16_t sport = p->sp;
diff --git a/src/preprocessors/Stream5/snort_stream5_session.h b/src/preprocessors/Stream5/snort_stream5_session.h
index b31be42..e2993b1 100644
--- a/src/preprocessors/Stream5/snort_stream5_session.h
+++ b/src/preprocessors/Stream5/snort_stream5_session.h
@@ -70,7 +70,7 @@ int GetLWSessionKeyFromIpPort(
                     uint16_t srcPort,
                     snort_ip_p dstIP,
                     uint16_t dstPort,
-                    char proto,
+                    uint8_t proto,
                     uint16_t vlan,
                     uint32_t mplsId,
                     uint16_t addressSpaceId,
diff --git a/src/preprocessors/Stream5/stream5_ha.c b/src/preprocessors/Stream5/stream5_ha.c
index 861ef66..bba861e 100644
--- a/src/preprocessors/Stream5/stream5_ha.c
+++ b/src/preprocessors/Stream5/stream5_ha.c
@@ -754,7 +754,7 @@ void Stream5HAConfigFree(Stream5HAConfig *config)
 // This MUST have the exact same logic as GetLWSessionKeyFromIpPort()
 // TBD any alternative to this approach?
 static inline bool IsClientLower(const sfip_t *cltIP, uint16_t cltPort,
-                                 const sfip_t *srvIP, uint16_t srvPort, char proto)
+                                 const sfip_t *srvIP, uint16_t srvPort, uint8_t proto)
 {
     if (IS_IP4(cltIP))
     {
diff --git a/src/preprocessors/spp_stream5.c b/src/preprocessors/spp_stream5.c
index a9c4bc3..448e510 100644
--- a/src/preprocessors/spp_stream5.c
+++ b/src/preprocessors/spp_stream5.c
@@ -256,7 +256,7 @@ static void *Stream5GetApplicationDataFromIpPort(
                     uint16_t srcPort,
                     snort_ip_p dstIP,
                     uint16_t dstPort,
-                    char ip_protocol,
+                    uint8_t ip_protocol,
                     uint16_t vlan,
                     uint32_t mplsId,
                     uint16_t addressSpaceId,
@@ -336,7 +336,7 @@ static uint16_t s5GetPreprocessorStatusBit(void);
 
 static void s5SetPortFilterStatus(
         struct _SnortConfig *sc,
-        int protocol,
+        uint8_t protocol,
         uint16_t port,
         uint16_t status,
         tSfPolicyId policyId,
@@ -345,7 +345,7 @@ static void s5SetPortFilterStatus(
 
 static void s5UnsetPortFilterStatus(
         struct _SnortConfig *sc,
-        int protocol,
+        uint8_t protocol,
         uint16_t port,
         uint16_t status,
         tSfPolicyId policyId,
@@ -359,7 +359,7 @@ static void *Stream5GetSessionPtrFromIpPort(
                     uint16_t srcPort,
                     snort_ip_p dstIP,
                     uint16_t dstPort,
-                    char ip_protocol,
+                    uint8_t ip_protocol,
                     uint16_t vlan,
                     uint32_t mplsId,
                     uint16_t addressSpaceId);
@@ -1937,7 +1937,7 @@ static void * Stream5GetSessionPtrFromIpPort(
                     uint16_t srcPort,
                     snort_ip_p dstIP,
                     uint16_t dstPort,
-                    char ip_protocol,
+                    uint8_t ip_protocol,
                     uint16_t vlan,
                     uint32_t mplsId,
                     uint16_t addressSpaceId)
@@ -1998,7 +1998,7 @@ static void * Stream5GetApplicationDataFromIpPort(
                     uint16_t srcPort,
                     snort_ip_p dstIP,
                     uint16_t dstPort,
-                    char ip_protocol,
+                    uint8_t ip_protocol,
                     uint16_t vlan,
                     uint32_t mplsId,
                     uint16_t addressSpaceID,
@@ -2656,7 +2656,7 @@ static uint16_t s5GetPreprocessorStatusBit(void)
 
 static void s5SetPortFilterStatus(
         struct _SnortConfig *sc,
-        int protocol,
+        uint8_t protocol,
         uint16_t port,
         uint16_t status,
         tSfPolicyId policyId,
@@ -2680,7 +2680,7 @@ static void s5SetPortFilterStatus(
 
 static void s5UnsetPortFilterStatus(
         struct _SnortConfig *sc,
-        int protocol,
+        uint8_t protocol,
         uint16_t port,
         uint16_t status,
         tSfPolicyId policyId,
diff --git a/src/preprocessors/stream_api.h b/src/preprocessors/stream_api.h
index 2032838..09cd38e 100644
--- a/src/preprocessors/stream_api.h
+++ b/src/preprocessors/stream_api.h
@@ -552,7 +552,7 @@ typedef struct _stream_api
      *  sure to set the parsing argument to 1.
      */
     void (*set_port_filter_status)(struct _SnortConfig *sc,
-                                   int protocol, uint16_t port, uint16_t status, tSfPolicyId policyId, int parsing);
+                                   uint8_t protocol, uint16_t port, uint16_t status, tSfPolicyId policyId, int parsing);
 
     /** Unset port to maintain session state. This function can only
      *  be used with independent bits acquired from
@@ -561,7 +561,7 @@ typedef struct _stream_api
      *  parsing argument to 1.
      */
     void (*unset_port_filter_status)(struct _SnortConfig *sc,
-                                     int protocol, uint16_t port, uint16_t status, tSfPolicyId policyId, int parsing);
+                                     uint8_t protocol, uint16_t port, uint16_t status, tSfPolicyId policyId, int parsing);
 
 #ifdef ACTIVE_RESPONSE
     // initialize response count and expiration time
@@ -713,7 +713,7 @@ typedef struct _stream_api
      * Returns
      *     Application Data reference (pointer)
      */
-    void *(*get_application_data_from_ip_port)(snort_ip_p, uint16_t, snort_ip_p, uint16_t, char, uint16_t, uint32_t, uint16_t, uint32_t);
+    void *(*get_application_data_from_ip_port)(snort_ip_p, uint16_t, snort_ip_p, uint16_t, uint8_t, uint16_t, uint32_t, uint16_t, uint32_t);
 
     //Register callbacks for extra data logging
     uint32_t (*reg_xtra_data_cb)(LogFunction );
@@ -751,7 +751,7 @@ typedef struct _stream_api
      * Returns
      *     Stream session pointer
      */
-    void *(*get_session_ptr_from_ip_port)(snort_ip_p, uint16_t, snort_ip_p, uint16_t, char, uint16_t, uint32_t, uint16_t);
+    void *(*get_session_ptr_from_ip_port)(snort_ip_p, uint16_t, snort_ip_p, uint16_t, uint8_t, uint16_t, uint32_t, uint16_t);
 
     /** Retrieve the session key given a stream session pointer.
      *