diff --git a/modules/libutil/public/Makefile.in b/modules/libutil/public/Makefile.in
index b01100a5594..7b4850f83a1 100644
--- a/modules/libutil/public/Makefile.in
+++ b/modules/libutil/public/Makefile.in
@@ -31,8 +31,7 @@ XPIDL_MODULE	= util
 
 PACKAGE_FILE = libutil.pkg
 
-EXPORTS		= $(srcdir)/xp_obs.h \
-              $(srcdir)/stopwatch.h \
+EXPORTS		= $(srcdir)/stopwatch.h \
 			  $(srcdir)/nsTimer.h
 
 include $(topsrcdir)/config/rules.mk
diff --git a/modules/libutil/public/xp_obs.h b/modules/libutil/public/xp_obs.h
deleted file mode 100644
index e69de29bb2d..00000000000
diff --git a/modules/libutil/src/Makefile.in b/modules/libutil/src/Makefile.in
index 71292de87de..c829b01b90b 100644
--- a/modules/libutil/src/Makefile.in
+++ b/modules/libutil/src/Makefile.in
@@ -31,7 +31,6 @@ LIBRARY_NAME	= mozutil_s
 REQUIRES	= xpcom \
 		  $(NULL)
 
-CSRCS		= obs.c
 CPPSRCS		= stopwatch.cpp
 
 FORCE_STATIC_LIB = 1
diff --git a/modules/libutil/src/obs.c b/modules/libutil/src/obs.c
deleted file mode 100644
index e69de29bb2d..00000000000