diff --git a/plugins/php/versions/55/src/zend_multiply.h b/plugins/php/versions/55/src/zend_multiply.h
index c5b8c7266..da96d12c6 100644
--- a/plugins/php/versions/55/src/zend_multiply.h
+++ b/plugins/php/versions/55/src/zend_multiply.h
@@ -62,7 +62,7 @@
 	__asm__("mul %0, %2, %3\n"										\
 		"smulh %1, %2, %3\n"										\
 		"sub %1, %1, %0, asr #63\n"									\
-			: "=r"(__tmpvar), "=r"(usedval)							\
+			: "=&r"(__tmpvar), "=&r"(usedval)							\
 			: "r"(a), "r"(b));										\
 	if (usedval) (dval) = (double) (a) * (double) (b);				\
 	else (lval) = __tmpvar;											\
diff --git a/plugins/php/versions/56/src/zend_multiply.h b/plugins/php/versions/56/src/zend_multiply.h
index dbb8bbae2..1da52b0b7 100644
--- a/plugins/php/versions/56/src/zend_multiply.h
+++ b/plugins/php/versions/56/src/zend_multiply.h
@@ -62,7 +62,7 @@
 	__asm__("mul %0, %2, %3\n"										\
 		"smulh %1, %2, %3\n"										\
 		"sub %1, %1, %0, asr #63\n"									\
-			: "=r"(__tmpvar), "=r"(usedval)							\
+			: "=&r"(__tmpvar), "=&r"(usedval)							\
 			: "r"(a), "r"(b));										\
 	if (usedval) (dval) = (double) (a) * (double) (b);				\
 	else (lval) = __tmpvar;											\