diff --git a/config/autoconf.mk.in b/config/autoconf.mk.in
index 32f146018cb..46380823576 100644
--- a/config/autoconf.mk.in
+++ b/config/autoconf.mk.in
@@ -283,7 +283,7 @@ OS_LDFLAGS	= @LDFLAGS@
 OS_COMPILE_CFLAGS = $(OS_CPPFLAGS) @COMPILE_CFLAGS@
 OS_COMPILE_CXXFLAGS = $(OS_CPPFLAGS) @COMPILE_CXXFLAGS@
 
-OS_INCLUDES	= $(NSPR_CFLAGS) $(JPEG_CFLAGS) $(PNG_CFLAGS) $(ZLIB_CFLAGS)
+OS_INCLUDES	= $(NSPR_CFLAGS) $(NSS_CFLAGS) $(JPEG_CFLAGS) $(PNG_CFLAGS) $(ZLIB_CFLAGS)
 OS_LIBS		= @LIBS@
 ACDEFINES	= @MOZ_DEFINES@