diff --git a/libbb/Makefile.in b/libbb/Makefile.in
index 91ff771..7d1686d 100644
--- a/libbb/Makefile.in
+++ b/libbb/Makefile.in
@@ -116,10 +116,10 @@
 libraries-y+=$(LIBBB_AR)
 
 needcrypt-y:=
-ifneq ($(findstring $(srcdir)/pw_encrypt.c,$(LIBBB-y)),)
+ifneq ($(filter $(srcdir)/pw_encrypt.c,$(LIBBB-y)),)
 needcrypt-y:=y
 else
-ifneq ($(findstring $(srcdir)/correct_password.c,$(LIBBB-y)),)
+ifneq ($(filter $(srcdir)/correct_password.c,$(LIBBB-y)),)
 needcrypt-y:=y
 endif
 endif