diff --git a/modules/libpref/src/Makefile.in b/modules/libpref/src/Makefile.in
index 2731c7e9ef8a..39a9e0f4598e 100644
--- a/modules/libpref/src/Makefile.in
+++ b/modules/libpref/src/Makefile.in
@@ -52,7 +52,7 @@ PREF_JS_EXPORTS	= \
 		$(NULL)
 
 ifdef MOZ_DEBUG
-PREF_JS_EXPORTS	+= $(srcdir)/debug-developer.js \
+PREF_JS_EXPORTS	+= $(srcdir)/debug-developer.js
 endif
 ifeq ($(MOZ_WIDGET_TOOLKIT),os2)
 PREF_JS_EXPORTS	+= $(srcdir)/os2/os2pref.js
@@ -63,7 +63,6 @@ else
 PREF_JS_EXPORTS	+= $(srcdir)/unix/unix.js
 endif
 endif
-endif
 
 ifeq ($(OS_ARCH),OpenVMS)
 PREF_JS_EXPORTS	+= $(srcdir)/unix/openvms.js