diff --git a/Zend/zend_API.c b/Zend/zend_API.c
index ba9a7744805..0ebdce2d7ba 100644
--- a/Zend/zend_API.c
+++ b/Zend/zend_API.c
@@ -412,7 +412,7 @@ static char *zend_parse_arg_impl(int arg_num, zval **arg, va_list *va, char **sp
 							long l;
 							int type;
 
-							if ((type = is_numeric_unicode(Z_USTRVAL_PP(arg), Z_USTRLEN_PP(arg), &l, p, 0)) == 0) {
+							if ((type = is_numeric_unicode(Z_USTRVAL_PP(arg), Z_USTRLEN_PP(arg), &l, p, -1)) == 0) {
 								return "double";
 							} else if (type == IS_LONG) {
 								*p = (double) l;
diff --git a/Zend/zend_operators.h b/Zend/zend_operators.h
index 44c4b6a8506..6bc46ecc2e4 100644
--- a/Zend/zend_operators.h
+++ b/Zend/zend_operators.h
@@ -147,7 +147,7 @@ static inline zend_uchar is_numeric_string(char *str, int length, long *lval, do
 	return 0;
 }
 
-static inline zend_uchar is_numeric_unicode(UChar *str, int length, long *lval, double *dval, zend_bool allow_errors)
+static inline zend_uchar is_numeric_unicode(UChar *str, int length, long *lval, double *dval, int allow_errors)
 {
 	long local_lval;
 	double local_dval;
@@ -200,6 +200,13 @@ static inline zend_uchar is_numeric_unicode(UChar *str, int length, long *lval,
 		}
 	}
 
+	if (!allow_errors) {
+		return 0;
+	}
+	if (allow_errors == -1) {
+		zend_error(E_NOTICE, "A non well formed numeric value encountered");
+	}
+
 	if (allow_errors) {
 		if (end_ptr_double > end_ptr_long && dval) {
 			*dval = local_dval;