diff --git a/py/asmx86.c b/py/asmx86.c
index 25f0db885290ce7b38406528c9dd8f66ac43257f..40958826fa6625f9c2195f44465aadc543e31c71 100644
--- a/py/asmx86.c
+++ b/py/asmx86.c
@@ -305,7 +305,7 @@ void asm_x86_mov_i8_to_r8(asm_x86_t *as, int src_i8, int dest_r32) {
 }
 #endif
 
-void asm_x86_mov_i32_to_r32(asm_x86_t *as, int src_i32, int dest_r32) {
+void asm_x86_mov_i32_to_r32(asm_x86_t *as, int32_t src_i32, int dest_r32) {
     asm_x86_write_byte_1(as, OPCODE_MOV_I32_TO_R32 | dest_r32);
     asm_x86_write_word32(as, src_i32);
 }