diff --git a/stage0/spl_disasm.c b/stage0/spl_disasm.c
index 6e50728..58c2679 100644
--- a/stage0/spl_disasm.c
+++ b/stage0/spl_disasm.c
@@ -59,14 +59,14 @@ int main(int argc, const char **argv) {
 
         /* annotate jumps / calls */
         if (ins->opcode == SPL_JMP || ins->opcode == SPL_BZ || ins->opcode == SPL_BNZ) {
-            long long target = (long long)i + 1 + (long long)ins->imm;
-            printf("  ; -> %zd", target);
+            spl_vm_val_t target = i + 1 + ins->imm;
+            printf("  ; -> %zu", target);
         } else if (ins->opcode == SPL_CALL) {
-            printf("  ; nargs=%zd, from stack", (long long)ins->imm);
+            printf("  ; nargs=%zu, from stack", ins->imm);
         } else if (ins->opcode == SPL_CALLI) {
             printf("  ; indirect call");
         } else if (ins->opcode == SPL_GADDR) {
-            printf("  ; gdata[%zd]", (long long)ins->imm);
+            printf("  ; gdata[%zu]", ins->imm);
         }
         printf("\n");
     }
diff --git a/stage0/spl_vm.c b/stage0/spl_vm.c
index c208f36..2f7633b 100644
--- a/stage0/spl_vm.c
+++ b/stage0/spl_vm.c
@@ -599,7 +599,10 @@ void spl_vm_add_breakpoint_fn(spl_vm_t *vm, const char *name) {
     for (usize i = 0; i < vec_size(vm->fn_breakpoints); i++)
         if (strcmp(vm->fn_breakpoints.data[i], name) == 0)
             return;
-    vec_push(vm->fn_breakpoints, strdup(name));
+    char *cpname = malloc(strlen(name) + 1);
+    Assert(cpname != NULL);
+    strcpy(cpname, name);
+    vec_push(vm->fn_breakpoints, cpname);
 }
 
 void spl_vm_clear_breakpoints(spl_vm_t *vm) {