diff --git a/src/uxn.c b/src/uxn.c
index 275b829..4e0bdbe 100644
--- a/src/uxn.c
+++ b/src/uxn.c
@@ -12,14 +12,14 @@ WITH REGARD TO THIS SOFTWARE.
 */
 
 #define OPC(opc, init, body) {\
-	case 0x00|opc: {enum{_2=0,_r=0};init body;} break;\
-	case 0x20|opc: {enum{_2=1,_r=0};init body;} break;\
-	case 0x40|opc: {enum{_2=0,_r=1};init body;} break;\
-	case 0x60|opc: {enum{_2=1,_r=1};init body;} break;\
-	case 0x80|opc: {enum{_2=0,_r=0};int k=uxn.wst.ptr;init uxn.wst.ptr= k;body;} break;\
-	case 0xa0|opc: {enum{_2=1,_r=0};int k=uxn.wst.ptr;init uxn.wst.ptr= k;body;} break;\
-	case 0xc0|opc: {enum{_2=0,_r=1};int k=uxn.rst.ptr;init uxn.rst.ptr= k;body;} break;\
-	case 0xe0|opc: {enum{_2=1,_r=1};int k=uxn.rst.ptr;init uxn.rst.ptr= k;body;} break;\
+	case 0x00|opc: {const int _2=0,_r=0;init body;} break;\
+	case 0x20|opc: {const int _2=1,_r=0;init body;} break;\
+	case 0x40|opc: {const int _2=0,_r=1;init body;} break;\
+	case 0x60|opc: {const int _2=1,_r=1;init body;} break;\
+	case 0x80|opc: {const int _2=0,_r=0;int k=uxn.wst.ptr;init uxn.wst.ptr= k;body;} break;\
+	case 0xa0|opc: {const int _2=1,_r=0;int k=uxn.wst.ptr;init uxn.wst.ptr= k;body;} break;\
+	case 0xc0|opc: {const int _2=0,_r=1;int k=uxn.rst.ptr;init uxn.rst.ptr= k;body;} break;\
+	case 0xe0|opc: {const int _2=1,_r=1;int k=uxn.rst.ptr;init uxn.rst.ptr= k;body;} break;\
 }
 
 /* Microcode */