diff --git a/mozilla/modules/libimg/src/makefile.win b/mozilla/modules/libimg/src/makefile.win
index 1ee61301459..7ea91d52a2a 100644
--- a/mozilla/modules/libimg/src/makefile.win
+++ b/mozilla/modules/libimg/src/makefile.win
@@ -92,11 +92,7 @@ DLL1NAME=img$(MOZ_BITS)$(VERSION_NUMBER)
 PDBFILE=$(DLLNAME).pdb
 MAPFILE=$(DLLNAME).map
 !if "$(MOZ_BITS)" == "16"
-!ifdef NSPR20
 DEFFILE=$(DLL1NAME).def
-!else
-DEFFILE=$(DLLNAME).def
-!endif
 !endif