diff --git a/make-bsd.mk b/make-bsd.mk
index 889e0e093..8234f2fdb 100644
--- a/make-bsd.mk
+++ b/make-bsd.mk
@@ -133,7 +133,7 @@ endif
 
 # Fail if system architecture could not be determined
 ifeq ($(ZT_ARCHITECTURE),999)
-ERR=$(error FATAL: architecture could not be determined from $(CC) -dumpmachine: $CC_MACH)
+ERR=$(error FATAL: architecture could not be determined from $(CC) -dumpmachine: $(CC_MACH))
 .PHONY: err
 err: ; $(ERR)
 endif