diff --git a/example/ndpiReader.c b/example/ndpiReader.c
index 0de29072441..4c5787e9c49 100644
--- a/example/ndpiReader.c
+++ b/example/ndpiReader.c
@@ -2805,46 +2805,6 @@ static void node_idle_scan_walker(const void *node, ndpi_VISIT which, int depth,
 
 /* *********************************************** */
 
-#if 0
-/**
- * @brief Print debug
- */
-static void debug_printf(u_int32_t protocol, void *id_struct,
-                         ndpi_log_level_t log_level,
-                         const char *format, ...) {
-  va_list va_ap;
-  struct tm result;
-
-  if(log_level <= nDPI_LogLevel) {
-    char buf[8192], out_buf[8192];
-    char theDate[32];
-    const char *extra_msg = "";
-    time_t theTime = time(NULL);
-
-    va_start (va_ap, format);
-
-    if(log_level == NDPI_LOG_ERROR)
-      extra_msg = "ERROR: ";
-    else if(log_level == NDPI_LOG_TRACE)
-      extra_msg = "TRACE: ";
-    else
-      extra_msg = "DEBUG: ";
-
-    memset(buf, 0, sizeof(buf));
-    strftime(theDate, 32, "%d/%b/%Y %H:%M:%S", localtime_r(&theTime,&result));
-    ndpi_snprintf(buf, sizeof(buf)-1, format, va_ap);
-
-    ndpi_snprintf(out_buf, sizeof(out_buf), "%s %s%s", theDate, extra_msg, buf);
-    printf("%s", out_buf);
-    fflush(stdout);
-  }
-
-  va_end(va_ap);
-}
-#endif
-
-/* *********************************************** */
-
 static int is_realtime_protocol(ndpi_protocol proto)
 {
   static u_int16_t const realtime_protos[] = {
diff --git a/fuzz/fuzz_ds_domain_classify.cpp b/fuzz/fuzz_ds_domain_classify.cpp
index ccb106a6f30..0938faec708 100644
--- a/fuzz/fuzz_ds_domain_classify.cpp
+++ b/fuzz/fuzz_ds_domain_classify.cpp
@@ -12,7 +12,7 @@ static struct ndpi_detection_module_struct *ndpi_struct = NULL;
 extern "C" {
 
 #ifdef NDPI_ENABLE_DEBUG_MESSAGES
-void ndpi_debug_printf(unsigned int proto, struct ndpi_detection_module_struct *ndpi_str, ndpi_log_level_t log_level,
+void ndpi_debug_printf(uint16_t proto, struct ndpi_detection_module_struct *ndpi_str, ndpi_log_level_t log_level,
                        const char *file_name, const char *func_name, unsigned int line_number, const char *format, ...);
 #endif
 
diff --git a/fuzz/fuzz_filecfg_malicious_sha1.c b/fuzz/fuzz_filecfg_malicious_sha1.c
index 5940dd7aff0..f460a987f79 100644
--- a/fuzz/fuzz_filecfg_malicious_sha1.c
+++ b/fuzz/fuzz_filecfg_malicious_sha1.c
@@ -3,7 +3,7 @@
 #include "fuzz_common_code.h"
 
 #ifdef NDPI_ENABLE_DEBUG_MESSAGES
-void ndpi_debug_printf(unsigned int proto, struct ndpi_detection_module_struct *ndpi_str, ndpi_log_level_t log_level,
+void ndpi_debug_printf(uint16_t proto, struct ndpi_detection_module_struct *ndpi_str, ndpi_log_level_t log_level,
                        const char *file_name, const char *func_name, unsigned int line_number, const char *format, ...);
 #endif
 
diff --git a/src/include/ndpi_typedefs.h b/src/include/ndpi_typedefs.h
index fc6a6c83789..dd32aa7273e 100644
--- a/src/include/ndpi_typedefs.h
+++ b/src/include/ndpi_typedefs.h
@@ -273,7 +273,7 @@ typedef struct ndpi_protocol_bitmask_struct {
 struct ndpi_detection_module_struct;
 
 /* NDPI_DEBUG_FUNCTION_PTR (cast) */
-typedef void (*ndpi_debug_function_ptr) (u_int32_t protocol, struct ndpi_detection_module_struct *module_struct,
+typedef void (*ndpi_debug_function_ptr) (u_int16_t protocol, struct ndpi_detection_module_struct *module_struct,
 					 ndpi_log_level_t log_level, const char *file,
 					 const char *func, unsigned line,
 					 const char *format, ...);
diff --git a/src/lib/ndpi_main.c b/src/lib/ndpi_main.c
index ba766a57b66..4565b8b07ba 100644
--- a/src/lib/ndpi_main.c
+++ b/src/lib/ndpi_main.c
@@ -3154,7 +3154,7 @@ void set_ndpi_flow_free(void (*__ndpi_flow_free)(void *ptr)) {
 }
 
 #ifdef NDPI_ENABLE_DEBUG_MESSAGES
-void ndpi_debug_printf(unsigned int proto, struct ndpi_detection_module_struct *ndpi_str, ndpi_log_level_t log_level,
+void ndpi_debug_printf(u_int16_t proto, struct ndpi_detection_module_struct *ndpi_str, ndpi_log_level_t log_level,
                        const char *file_name, const char *func_name, unsigned int line_number, const char *format, ...) {
   va_list args;
 #define MAX_STR_LEN 250