diff --git a/src/assembler/assemble.c b/src/assembler/assemble.c
index 9e4847a..217e3c1 100644
--- a/src/assembler/assemble.c
+++ b/src/assembler/assemble.c
@@ -135,6 +135,7 @@ Program createProgramFromText(const char* input) {
                         case OP_IMM16: {
                             char* endptr;
                             instruction.immediate = strtol(buf, &endptr, 0);
+                            instruction.hasImm16 = true;
                             if (endptr == (char*)buf) {
                                 fprintf(stderr, "couldn't convert %s to a number\n", buf);
                                 exit(1);