diff --git a/i386-asm.c b/i386-asm.c
index 3d87e92..473088b 100644
--- a/i386-asm.c
+++ b/i386-asm.c
@@ -423,7 +423,7 @@ static void parse_operand(TCCState *s1, Operand *op)
             if (op->e.v == (uint16_t)op->e.v)
                 op->type |= OP_IM16;
 #ifdef TCC_TARGET_X86_64
-            if (op->e.v != (int32_t)op->e.v)
+            if (op->e.v != (int32_t)op->e.v && op->e.v != (uint32_t)op->e.v)
                 op->type = OP_IM64;
 #endif
         }
diff --git a/tests/asmtest.S b/tests/asmtest.S
index c19db06..59deb06 100644
--- a/tests/asmtest.S
+++ b/tests/asmtest.S
@@ -49,6 +49,8 @@ movw %ax, 0x100(%ebx,%edx,2)
 
 movw $0x1122,%si
 movl $0x112233,%edx
+movl $0x80000000, %esi
+movl $-0x7fffffff, %edi
 #ifdef __x86_64__
 mov $0x11223344,%rbx
 movq $0x11223344,%rbx