diff --git a/src/asmjit/x86/x86assembler.cpp b/src/asmjit/x86/x86assembler.cpp
index 4b18d3e..ee76a25 100644
--- a/src/asmjit/x86/x86assembler.cpp
+++ b/src/asmjit/x86/x86assembler.cpp
@@ -2071,7 +2071,7 @@ CaseX86PushPop_Gp:
         }
 
         // Short form - AL, AX, EAX, RAX.
-        if (o0.id() == 0 && !(options & Inst::kOptionLongForm)) {
+        if (rbReg == 0 && !(options & Inst::kOptionLongForm)) {
           opcode &= Opcode::kPP_66 | Opcode::kW;
           opcode |= 0xA8 + (o0.size() != 1);
           goto EmitX86Op;