diff --git a/configure.in b/configure.in
index bfe91c2e64e1..bee9eb2c92bd 100644
--- a/configure.in
+++ b/configure.in
@@ -809,6 +809,7 @@ js/Makefile
 js/jsd/Makefile
 js/jsd/classes/Makefile
 js/src/Makefile
+js/src/fdlibm/Makefile
 js/src/liveconnect/Makefile
 js/src/liveconnect/classes/Makefile
 js/src/xpcom/Makefile