diff --git a/lib/hcrypto/NTMakefile b/lib/hcrypto/NTMakefile
index 539494b79..1b2c166a1 100644
--- a/lib/hcrypto/NTMakefile
+++ b/lib/hcrypto/NTMakefile
@@ -96,6 +96,7 @@ libhcrypto_OBJs = 			\
 	$(OBJ)\bn.obj			\
 	$(OBJ)\camellia.obj		\
 	$(OBJ)\camellia-ntt.obj		\
+	$(OBJ)\common.obj		\
 	$(OBJ)\des.obj			\
 	$(OBJ)\dh.obj			\
 	$(OBJ)\dh-imath.obj		\