diff --git a/frankenphp.c b/frankenphp.c
index f9be7a5a22..1c67d2b640 100644
--- a/frankenphp.c
+++ b/frankenphp.c
@@ -1161,30 +1161,13 @@ int frankenphp_execute_script_cli(char *script, int argc, char **argv) {
   return (intptr_t)exit_status;
 }
 
-int frankenphp_execute_php_function(const char *php_function) {
-  zval retval = {0};
-  zend_fcall_info fci = {0};
-  zend_fcall_info_cache fci_cache = {0};
-  zend_string *func_name =
-      zend_string_init(php_function, strlen(php_function), 0);
-  ZVAL_STR(&fci.function_name, func_name);
-  fci.size = sizeof fci;
-  fci.retval = &retval;
-  int success = 0;
-
-  zend_try { success = zend_call_function(&fci, &fci_cache) == SUCCESS; }
-  zend_end_try();
-
-  zend_string_release(func_name);
-
-  return success;
-}
-
 int frankenphp_reset_opcache(void) {
-  if (zend_hash_str_exists(CG(function_table), "opcache_reset",
-                           sizeof("opcache_reset") - 1)) {
-    return frankenphp_execute_php_function("opcache_reset");
+  zend_function *opcache_reset =
+      zend_hash_str_find_ptr(CG(function_table), ZEND_STRL("opcache_reset"));
+  if (opcache_reset) {
+    zend_call_known_function(opcache_reset, NULL, NULL, NULL, 0, NULL, NULL);
   }
+
   return 0;
 }
 
diff --git a/frankenphp.go b/frankenphp.go
index 57d4a7cb3c..17caea1c9b 100644
--- a/frankenphp.go
+++ b/frankenphp.go
@@ -653,13 +653,6 @@ func freeArgs(argv []*C.char) {
 	}
 }
 
-func executePHPFunction(functionName string) bool {
-	cFunctionName := C.CString(functionName)
-	defer C.free(unsafe.Pointer(cFunctionName))
-
-	return C.frankenphp_execute_php_function(cFunctionName) == 1
-}
-
 func timeoutChan(timeout time.Duration) <-chan time.Time {
 	if timeout == 0 {
 		return nil
diff --git a/frankenphp.h b/frankenphp.h
index d47adb47b3..7839bcf7e0 100644
--- a/frankenphp.h
+++ b/frankenphp.h
@@ -63,8 +63,6 @@ int frankenphp_execute_script(char *file_name);
 
 int frankenphp_execute_script_cli(char *script, int argc, char **argv);
 
-int frankenphp_execute_php_function(const char *php_function);
-
 void frankenphp_register_variables_from_request_info(
     zval *track_vars_array, zend_string *content_type,
     zend_string *path_translated, zend_string *query_string,