diff --git a/src/comp.c b/src/comp.c
index 85b0983a6df..eacda5de550 100644
--- a/src/comp.c
+++ b/src/comp.c
@@ -866,7 +866,7 @@ emit_const_lisp_obj (Lisp_Object obj)
   emit_comment (format_string ("const lisp obj: %s",
 			       SSDATA (Fprin1_to_string (obj, Qnil))));
 
-  if (Qnil == NULL && EQ (obj, Qnil))
+  if (NIL_IS_ZERO && EQ (obj, Qnil))
     return emit_cast (comp.lisp_obj_type,
 		      gcc_jit_context_new_rvalue_from_ptr (comp.ctxt,
 							   comp.void_ptr_type,
diff --git a/src/data.c b/src/data.c
index 191fb313687..8901ffbb2c3 100644
--- a/src/data.c
+++ b/src/data.c
@@ -919,7 +919,7 @@ Value, if non-nil, is a list (interactive SPEC).  */)
 
   if (SUBRP (fun))
     {
-      if (SUBR_NATIVE_COMPILEDP (fun) && XSUBR (fun)->native_intspec)
+      if (SUBR_NATIVE_COMPILEDP (fun) && !NILP (XSUBR (fun)->native_intspec))
 	return XSUBR (fun)->native_intspec;
 
       const char *spec = XSUBR (fun)->intspec;
diff --git a/src/lisp.h b/src/lisp.h
index 69db8cdef10..2d083dc4582 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -4761,7 +4761,7 @@ extern char *emacs_root_dir (void);
 INLINE bool
 SUBR_NATIVE_COMPILEDP (Lisp_Object a)
 {
-  return SUBRP (a) && XSUBR (a)->native_comp_u[0];
+  return SUBRP (a) && !NILP (XSUBR (a)->native_comp_u[0]);
 }
 
 INLINE struct Lisp_Native_Comp_Unit *
diff --git a/src/pdumper.c b/src/pdumper.c
index 81d48496be2..a35cc7ffcd6 100644
--- a/src/pdumper.c
+++ b/src/pdumper.c
@@ -2948,13 +2948,13 @@ dump_subr (struct dump_context *ctx, const struct Lisp_Subr *subr)
   struct Lisp_Subr out;
   dump_object_start (ctx, &out, sizeof (out));
   DUMP_FIELD_COPY (&out, subr, header.size);
-  if (NATIVE_COMP_FLAG && subr->native_comp_u[0])
+  if (NATIVE_COMP_FLAG && !NILP (subr->native_comp_u[0]))
     out.function.a0 = NULL;
   else
     dump_field_emacs_ptr (ctx, &out, subr, &subr->function.a0);
   DUMP_FIELD_COPY (&out, subr, min_args);
   DUMP_FIELD_COPY (&out, subr, max_args);
-  if (NATIVE_COMP_FLAG && subr->native_comp_u[0])
+  if (NATIVE_COMP_FLAG && !NILP (subr->native_comp_u[0]))
     {
       dump_field_fixup_later (ctx, &out, subr, &subr->symbol_name);
       dump_remember_cold_op (ctx,
@@ -2973,7 +2973,7 @@ dump_subr (struct dump_context *ctx, const struct Lisp_Subr *subr)
     dump_field_lv (ctx, &out, subr, &subr->native_comp_u[0], WEIGHT_NORMAL);
 
   dump_off subr_off = dump_object_finish (ctx, &out, sizeof (out));
-  if (ctx->flags.dump_object_contents && subr->native_comp_u[0])
+  if (ctx->flags.dump_object_contents && !NILP (subr->native_comp_u[0]))
     /* We'll do the final addr relocation during VERY_LATE_RELOCS time
        after the compilation units has been loaded. */
     dump_push (&ctx->dump_relocs[VERY_LATE_RELOCS],