diff --git a/mingw-w64-crt/Makefile.am b/mingw-w64-crt/Makefile.am
index 229a6aa..6a28350 100644
--- a/mingw-w64-crt/Makefile.am
+++ b/mingw-w64-crt/Makefile.am
@@ -47,7 +47,7 @@
   DTDEF64=$(DLLTOOL) $(DLLTOOLFLAGS64) $(AM_DLLTOOLFLAGS) --input-def
 endif
 if DLLTOOL_HAS_TEMP_PREFIX
-  AM_DLLTOOLFLAGS += --temp-prefix $$(basename $@ .a)
+  AM_DLLTOOLFLAGS += --temp-prefix $(basename $@)
 endif
 if DELAY_IMPORT_LIBS
   AM_DLLTOOLFLAGS += --output-delaylib $@.delayimp.a