diff --git a/src/Make_cyg_ming.mak b/src/Make_cyg_ming.mak
index 026c966..28d31d6 100644
--- a/src/Make_cyg_ming.mak
+++ b/src/Make_cyg_ming.mak
@@ -679,8 +679,10 @@
 # Cannot use Netbeans without CHANNEL
 NETBEANS=no
 else
-# Only allow NETBEANS for a GUI build.
-ifeq (yes, $(GUI))
+ifneq (yes, $(GUI))
+# Cannot use Netbeans without GUI.
+NETBEANS=no
+else
 OBJ += $(OUTDIR)/netbeans.o
 LIB += -lwsock32
 endif