diff --git a/ext/soap/soap.c b/ext/soap/soap.c
index 42a23c88912..2d09138f487 100644
--- a/ext/soap/soap.c
+++ b/ext/soap/soap.c
@@ -511,6 +511,7 @@ PHP_RINIT_FUNCTION(soap)
 	SOAP_GLOBAL(encoding) = NULL;
 	SOAP_GLOBAL(class_map) = NULL;
 	SOAP_GLOBAL(features) = 0;
+	SOAP_GLOBAL(ref_map) = NULL;
 	return SUCCESS;
 }