diff --git a/gtests/net/packetdrill/Makefile.Darwin b/gtests/net/packetdrill/Makefile.Darwin
index 3f5395881dad905e6a6019556d6a27add3b2b019..dc89480bbca9f7e5e64fcb3a27af046f3546dd7e 100644
--- a/gtests/net/packetdrill/Makefile.Darwin
+++ b/gtests/net/packetdrill/Makefile.Darwin
@@ -1,7 +1,7 @@
 packetdrill-ext-libs := -pthread -lpcap
 CFLAGS = -D__APPLE_USE_RFC_3542
 LDFLAGS =
-ifeq ("$(wildcard $(/usr/lib/libsctp.dylib))","")
+ifneq ("$(wildcard /usr/lib/libsctp.dylib)","")
     packetdrill-ext-libs += -lsctp
     CFLAGS += -DHAVE_SCTP
 endif