diff --git a/Python/ceval.c b/Python/ceval.c
index 51df60a..d3a0053 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -627,8 +627,7 @@
 
 #define INSTR_OFFSET()	(next_instr - first_instr)
 #define NEXTOP()	(*next_instr++)
-#define OPARG()		(next_instr[0] + (next_instr[1]<<8))
-#define OPARG_SIZE	2
+#define NEXTARG()	(next_instr += 2, (next_instr[-1]<<8) + next_instr[-2])
 #define JUMPTO(x)	(next_instr = first_instr + (x))
 #define JUMPBY(x)	(next_instr += (x))
 
@@ -659,7 +658,8 @@
 #endif
 
 #define PREDICTED(op)		PRED_##op: next_instr++
-#define PREDICTED_WITH_ARG(op)	PRED_##op: next_instr++; oparg = OPARG(); next_instr += OPARG_SIZE
+#define PREDICTED_WITH_ARG(op)	PRED_##op: oparg = (next_instr[2]<<8) + \
+				next_instr[1]; next_instr += 3
 
 /* Stack manipulation macros */
 
@@ -862,11 +862,8 @@
 		/* Extract opcode and argument */
 
 		opcode = NEXTOP();
-		if (HAS_ARG(opcode)) {
-			oparg = OPARG();
-			next_instr += OPARG_SIZE;
-		}
-
+		if (HAS_ARG(opcode))
+			oparg = NEXTARG();
 	  dispatch_opcode:
 #ifdef DYNAMIC_EXECUTION_PROFILE
 #ifdef DXPAIRS
@@ -2252,8 +2249,7 @@
 
 		case EXTENDED_ARG:
 			opcode = NEXTOP();
-			oparg = oparg<<16 | OPARG();
-			next_instr += OPARG_SIZE;
+			oparg = oparg<<16 | NEXTARG();
 			goto dispatch_opcode;
 
 		default: