diff --git a/Zend/Optimizer/block_pass.c b/Zend/Optimizer/block_pass.c
index 9ca8b60f6c4..730ac67ef34 100644
--- a/Zend/Optimizer/block_pass.c
+++ b/Zend/Optimizer/block_pass.c
@@ -30,7 +30,7 @@
 #include "zend_dump.h"
 
 /* Checks if a constant (like "true") may be replaced by its value */
-bool zend_optimizer_get_persistent_constant(zend_string *name, zval *result, int copy)
+bool zend_optimizer_get_persistent_constant(zend_string *name, zval *result, bool copy)
 {
 	zend_constant *c = zend_hash_find_ptr(EG(zend_constants), name);
 	if (c) {
@@ -371,7 +371,7 @@ static void zend_optimize_block(zend_basic_block *block, zend_op_array *op_array
 					}
 				} else if(flen == sizeof("constant")-1 && zend_binary_strcasecmp(fname, flen, "constant", sizeof("constant")-1) == 0) {
 					zval c;
-					if (zend_optimizer_get_persistent_constant(Z_STR_P(arg), &c, 1 ELS_CC)) {
+					if (zend_optimizer_get_persistent_constant(Z_STR_P(arg), &c, true ELS_CC)) {
 						literal_dtor(arg);
 						MAKE_NOP(sv);
 						MAKE_NOP(fcall);
diff --git a/Zend/Optimizer/pass1.c b/Zend/Optimizer/pass1.c
index 735910d52b4..09a0ae5fec5 100644
--- a/Zend/Optimizer/pass1.c
+++ b/Zend/Optimizer/pass1.c
@@ -149,7 +149,7 @@ void zend_optimizer_pass1(zend_op_array *op_array, zend_optimizer_ctx *ctx)
 			if (opline->op2_type == IS_CONST &&
 				Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING) {
 				/* substitute persistent constants */
-				if (!zend_optimizer_get_persistent_constant(Z_STR(ZEND_OP2_LITERAL(opline)), &result, 1)) {
+				if (!zend_optimizer_get_persistent_constant(Z_STR(ZEND_OP2_LITERAL(opline)), &result, true)) {
 					if (!ctx->constants || !zend_optimizer_get_collected_constant(ctx->constants, &ZEND_OP2_LITERAL(opline), &result)) {
 						break;
 					}
@@ -171,7 +171,7 @@ void zend_optimizer_pass1(zend_op_array *op_array, zend_optimizer_ctx *ctx)
 			if (Z_TYPE_P(c) == IS_CONSTANT_AST) {
 				zend_ast *ast = Z_ASTVAL_P(c);
 				if (ast->kind != ZEND_AST_CONSTANT
-				 || !zend_optimizer_get_persistent_constant(zend_ast_get_constant_name(ast), &result, 1)
+				 || !zend_optimizer_get_persistent_constant(zend_ast_get_constant_name(ast), &result, true)
 				 || Z_TYPE(result) == IS_CONSTANT_AST) {
 					break;
 				}
@@ -271,7 +271,7 @@ void zend_optimizer_pass1(zend_op_array *op_array, zend_optimizer_ctx *ctx)
 			}
 			break;
 		case ZEND_DEFINED:
-			if (!zend_optimizer_get_persistent_constant(Z_STR(ZEND_OP1_LITERAL(opline)), &result, 0)) {
+			if (!zend_optimizer_get_persistent_constant(Z_STR(ZEND_OP1_LITERAL(opline)), &result, false)) {
 				break;
 			}
 			ZVAL_TRUE(&result);
diff --git a/Zend/Optimizer/zend_optimizer.c b/Zend/Optimizer/zend_optimizer.c
index 6e6be672693..b57ad3ad426 100644
--- a/Zend/Optimizer/zend_optimizer.c
+++ b/Zend/Optimizer/zend_optimizer.c
@@ -145,7 +145,7 @@ zend_result zend_optimizer_eval_special_func_call(
 		return FAILURE;
 	}
 	if (zend_string_equals_literal(name, "constant")) {
-		return zend_optimizer_get_persistent_constant(arg, result, 1) ? SUCCESS : FAILURE;
+		return zend_optimizer_get_persistent_constant(arg, result, true) ? SUCCESS : FAILURE;
 	}
 	if (zend_string_equals_literal(name, "dirname")) {
 		if (!IS_ABSOLUTE_PATH(ZSTR_VAL(arg), ZSTR_LEN(arg))) {
diff --git a/Zend/Optimizer/zend_optimizer_internal.h b/Zend/Optimizer/zend_optimizer_internal.h
index 8814a3846ea..869275811e3 100644
--- a/Zend/Optimizer/zend_optimizer_internal.h
+++ b/Zend/Optimizer/zend_optimizer_internal.h
@@ -80,7 +80,7 @@ static inline bool zend_optimizer_is_loop_var_free(const zend_op *opline) {
 
 void zend_optimizer_convert_to_free_op1(const zend_op_array *op_array, zend_op *opline);
 uint32_t zend_optimizer_add_literal(zend_op_array *op_array, const zval *zv);
-bool zend_optimizer_get_persistent_constant(zend_string *name, zval *result, int copy);
+bool zend_optimizer_get_persistent_constant(zend_string *name, zval *result, bool copy);
 void zend_optimizer_collect_constant(zend_optimizer_ctx *ctx, const zval *name, zval* value);
 bool zend_optimizer_get_collected_constant(const HashTable *constants, const zval *name, zval* value);
 zend_result zend_optimizer_eval_binary_op(zval *result, uint8_t opcode, zval *op1, zval *op2);