diff --git a/Z80.CPU/v1.0/API/C/emulation/CPU/Z80.h b/Z80.CPU/v1.0/API/C/emulation/CPU/Z80.h
index fee33e9..a96bc08 100644
--- a/Z80.CPU/v1.0/API/C/emulation/CPU/Z80.h
+++ b/Z80.CPU/v1.0/API/C/emulation/CPU/Z80.h
@@ -37,7 +37,7 @@ typedef struct {
 	quint8	  r7;
 	Q32Bit	  data;
 
-#	ifndef EMULATION_CPU_Z80_NO_SLOTS
+#	ifdef EMULATION_CPU_Z80_NO_SLOTS
 		void* cb_context;
 #	endif