diff --git a/mozilla/configure.in b/mozilla/configure.in
index ac2297332bf..93edafb8b69 100644
--- a/mozilla/configure.in
+++ b/mozilla/configure.in
@@ -400,6 +400,8 @@ fi
 
 CFLAGS="$CFLAGS -DMOZ_TOOLKIT=$MOZ_TOOLKIT"
 
+CFLAGS="$CFLAGS -DMOZ_DLL_SUFFIX=$DLL_SUFFIX"
+
 OS_TARGET=`uname -s`
 
 AC_ARG_ENABLE(shared,