diff --git a/asn1/s1ap/packet-s1ap-template.c b/asn1/s1ap/packet-s1ap-template.c
index f7d4c49f1c..6f1a603152 100644
--- a/asn1/s1ap/packet-s1ap-template.c
+++ b/asn1/s1ap/packet-s1ap-template.c
@@ -30,7 +30,6 @@
 #include <glib.h>
 #include <epan/packet.h>
 
-#include <ctype.h>
 #include <epan/strutil.h>
 #include <epan/asn1.h>
 #include <epan/prefs.h>
diff --git a/asn1/s1ap/s1ap.cnf b/asn1/s1ap/s1ap.cnf
index d8d247a791..ed28c8f32b 100644
--- a/asn1/s1ap/s1ap.cnf
+++ b/asn1/s1ap/s1ap.cnf
@@ -231,7 +231,7 @@ obj_id = NULL;
 
   is_ascii = TRUE;
   for (p_offset=0; p_offset < length; p_offset++){
-	 if(!isalpha(tvb_get_guint8(parameter_tvb, p_offset ))){
+	 if(!g_ascii_isprint(tvb_get_guint8(parameter_tvb, p_offset ))){
 		is_ascii = FALSE;
 		break;
 	 }
diff --git a/epan/dissectors/packet-s1ap.c b/epan/dissectors/packet-s1ap.c
index 8f6642c35d..882721e726 100644
--- a/epan/dissectors/packet-s1ap.c
+++ b/epan/dissectors/packet-s1ap.c
@@ -38,7 +38,6 @@
 #include <glib.h>
 #include <epan/packet.h>
 
-#include <ctype.h>
 #include <epan/strutil.h>
 #include <epan/asn1.h>
 #include <epan/prefs.h>
@@ -362,7 +361,7 @@ typedef enum _ProtocolIE_ID_enum {
 } ProtocolIE_ID_enum;
 
 /*--- End of included file: packet-s1ap-val.h ---*/
-#line 68 "../../asn1/s1ap/packet-s1ap-template.c"
+#line 67 "../../asn1/s1ap/packet-s1ap-template.c"
 
 /* Initialize the protocol and registered fields */
 static int proto_s1ap = -1;
@@ -920,7 +919,7 @@ static int hf_s1ap_eHRPD_Sector_ID_01 = -1;       /* EHRPD_Sector_ID */
 static int hf_s1ap_eHRPDSectorLoadReportingResponse = -1;  /* EHRPDSectorLoadReportingResponse */
 
 /*--- End of included file: packet-s1ap-hf.c ---*/
-#line 75 "../../asn1/s1ap/packet-s1ap-template.c"
+#line 74 "../../asn1/s1ap/packet-s1ap-template.c"
 
 /* Initialize the subtree pointers */
 static int ett_s1ap = -1;
@@ -1209,7 +1208,7 @@ static gint ett_s1ap_EHRPDCompositeAvailableCapacity = -1;
 static gint ett_s1ap_EHRPDMultiSectorLoadReportingResponseItem = -1;
 
 /*--- End of included file: packet-s1ap-ett.c ---*/
-#line 87 "../../asn1/s1ap/packet-s1ap-template.c"
+#line 86 "../../asn1/s1ap/packet-s1ap-template.c"
 
 enum{
 	INITIATING_MESSAGE,
@@ -3472,7 +3471,7 @@ dissect_s1ap_ENBname(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, pr
 
   is_ascii = TRUE;
   for (p_offset=0; p_offset < length; p_offset++){
-	 if(!isalpha(tvb_get_guint8(parameter_tvb, p_offset ))){
+	 if(!g_ascii_isprint(tvb_get_guint8(parameter_tvb, p_offset ))){
 		is_ascii = FALSE;
 		break;
 	 }
@@ -10473,7 +10472,7 @@ int dissect_s1ap_SONtransferCause_PDU(tvbuff_t *tvb _U_, packet_info *pinfo _U_,
 
 
 /*--- End of included file: packet-s1ap-fn.c ---*/
-#line 136 "../../asn1/s1ap/packet-s1ap-template.c"
+#line 135 "../../asn1/s1ap/packet-s1ap-template.c"
 
 static int dissect_ProtocolIEFieldValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
 {
@@ -10810,7 +10809,7 @@ proto_reg_handoff_s1ap(void)
 
 
 /*--- End of included file: packet-s1ap-dis-tab.c ---*/
-#line 223 "../../asn1/s1ap/packet-s1ap-template.c"
+#line 222 "../../asn1/s1ap/packet-s1ap-template.c"
 	} else {
 		if (SctpPort != 0) {
 			dissector_delete_uint("sctp.port", SctpPort, s1ap_handle);
@@ -13027,7 +13026,7 @@ void proto_register_s1ap(void) {
         NULL, HFILL }},
 
 /*--- End of included file: packet-s1ap-hfarr.c ---*/
-#line 251 "../../asn1/s1ap/packet-s1ap-template.c"
+#line 250 "../../asn1/s1ap/packet-s1ap-template.c"
   };
 
   /* List of subtrees */
@@ -13317,7 +13316,7 @@ void proto_register_s1ap(void) {
     &ett_s1ap_EHRPDMultiSectorLoadReportingResponseItem,
 
 /*--- End of included file: packet-s1ap-ettarr.c ---*/
-#line 264 "../../asn1/s1ap/packet-s1ap-template.c"
+#line 263 "../../asn1/s1ap/packet-s1ap-template.c"
   };
 
   module_t *s1ap_module;