diff --git a/Zend/Makefile.am b/Zend/Makefile.am
index 26945b7b273b3..42ae4d5424953 100644
--- a/Zend/Makefile.am
+++ b/Zend/Makefile.am
@@ -17,7 +17,7 @@ libZend_la_SOURCES=\
 	zend_objects_API.c zend_ts_hash.c zend_stream.c zend_mm.c \
 	zend_default_classes.c zend_reflection_api.c \
 	zend_iterators.c zend_interfaces.c zend_exceptions.c \
-	zend_strtod.c
+	zend_strtod.c zend_multibyte.c
 
 libZend_la_LDFLAGS =
 libZend_la_LIBADD = @ZEND_EXTRA_LIBS@