diff --git a/ext/curl/multi.c b/ext/curl/multi.c
index 628fc197849f2..fcf21ebad76b7 100644
--- a/ext/curl/multi.c
+++ b/ext/curl/multi.c
@@ -523,7 +523,7 @@ static zend_function *curl_multi_get_constructor(zend_object *object) {
 	return NULL;
 }
 
-void curl_multi_free_obj(zend_object *object)
+static void curl_multi_free_obj(zend_object *object)
 {
 	php_curlm *mh = curl_multi_from_obj(object);
 
diff --git a/ext/date/php_date.c b/ext/date/php_date.c
index f48d56194f1b2..96b708d70395d 100644
--- a/ext/date/php_date.c
+++ b/ext/date/php_date.c
@@ -520,7 +520,7 @@ static timelib_tzinfo *php_date_parse_tzfile(const char *formal_tzname, const ti
 	return tzi;
 }
 
-timelib_tzinfo *php_date_parse_tzfile_wrapper(const char *formal_tzname, const timelib_tzdb *tzdb, int *dummy_error_code)
+static timelib_tzinfo *php_date_parse_tzfile_wrapper(const char *formal_tzname, const timelib_tzdb *tzdb, int *dummy_error_code)
 {
 	return php_date_parse_tzfile(formal_tzname, tzdb);
 }
@@ -2947,7 +2947,7 @@ PHP_FUNCTION(date_get_last_errors)
 }
 /* }}} */
 
-void php_date_do_return_parsed_time(INTERNAL_FUNCTION_PARAMETERS, timelib_time *parsed_time, timelib_error_container *error) /* {{{ */
+static void php_date_do_return_parsed_time(INTERNAL_FUNCTION_PARAMETERS, timelib_time *parsed_time, timelib_error_container *error) /* {{{ */
 {
 	zval element;
 
diff --git a/ext/dba/dba.c b/ext/dba/dba.c
index b0af036e338cc..86b99ad4bb6f0 100644
--- a/ext/dba/dba.c
+++ b/ext/dba/dba.c
@@ -293,7 +293,7 @@ static void dba_close_rsrc(zend_resource *rsrc)
 /* }}} */
 
 /* {{{ dba_close_pe_rsrc_deleter */
-int dba_close_pe_rsrc_deleter(zval *el, void *pDba)
+static int dba_close_pe_rsrc_deleter(zval *el, void *pDba)
 {
 	if (Z_RES_P(el)->ptr == pDba) {
 		if (Z_DELREF_P(el) == 0) {
@@ -318,7 +318,7 @@ static void dba_close_pe_rsrc(zend_resource *rsrc)
 /* }}} */
 
 /* {{{ PHP_INI */
-ZEND_INI_MH(OnUpdateDefaultHandler)
+static ZEND_INI_MH(OnUpdateDefaultHandler)
 {
 	const dba_handler *hptr;
 
@@ -431,7 +431,7 @@ static void php_dba_update(INTERNAL_FUNCTION_PARAMETERS, int mode)
 /* }}} */
 
 /* {{{ php_find_dbm */
-dba_info *php_dba_find(const char* path)
+static dba_info *php_dba_find(const char* path)
 {
 	zend_resource *le;
 	dba_info *info;
diff --git a/ext/libxml/libxml.c b/ext/libxml/libxml.c
index e4b78939ddd79..634195cb57624 100644
--- a/ext/libxml/libxml.c
+++ b/ext/libxml/libxml.c
@@ -707,7 +707,7 @@ PHP_LIBXML_API void php_libxml_ctx_warning(void *ctx, const char *msg, ...)
 	va_end(args);
 }
 
-PHP_LIBXML_API void php_libxml_structured_error_handler(void *userData, xmlErrorPtr error)
+static void php_libxml_structured_error_handler(void *userData, xmlErrorPtr error)
 {
 	_php_list_set_error_structure(error, NULL);
 
diff --git a/ext/sqlite3/sqlite3.c b/ext/sqlite3/sqlite3.c
index 2483899a7d10e..2b8cbe33dd94e 100644
--- a/ext/sqlite3/sqlite3.c
+++ b/ext/sqlite3/sqlite3.c
@@ -39,7 +39,7 @@ static void sqlite3_param_dtor(zval *data);
 static int php_sqlite3_compare_stmt_zval_free(php_sqlite3_free_list **free_list, zval *statement);
 
 /* {{{ Error Handler */
-static void php_sqlite3_error(php_sqlite3_db_object *db_obj, char *format, ...)
+static void php_sqlite3_error(php_sqlite3_db_object *db_obj, const char *format, ...)
 {
 	va_list arg;
 	char 	*message;