diff --git a/bsd-user/main.c b/bsd-user/main.c
index 28f122b80e6b29b5e2d89dfaa942343dbf8c1bae..0bfe46cff93e723fd1f135528eb65bb35a3c8a91 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -42,7 +42,7 @@
 int singlestep;
 unsigned long mmap_min_addr;
 unsigned long guest_base;
-int have_guest_base;
+bool have_guest_base;
 unsigned long reserved_va;
 
 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
@@ -828,7 +828,7 @@ int main(int argc, char **argv)
             }
         } else if (!strcmp(r, "B")) {
            guest_base = strtol(argv[optind++], NULL, 0);
-           have_guest_base = 1;
+           have_guest_base = true;
         } else if (!strcmp(r, "drop-ld-preload")) {
             (void) envlist_unsetenv(envlist, "LD_PRELOAD");
         } else if (!strcmp(r, "bsd")) {
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index 43ddcf024c6fd091ebc91c008d2d87af0b969758..0895a57881a0e6bb4dd3ddee5530090b1a9ea63c 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -159,7 +159,7 @@ static inline void tswap64s(uint64_t *s)
  * This allows the guest address space to be offset to a convenient location.
  */
 extern unsigned long guest_base;
-extern int have_guest_base;
+extern bool have_guest_base;
 extern unsigned long reserved_va;
 
 #if HOST_LONG_BITS <= TARGET_VIRT_ADDR_SPACE_BITS
diff --git a/linux-user/main.c b/linux-user/main.c
index e18c1fb9523e71d8ff6ab5099f61562732958f15..3597e99bb10a8e2ff1ababbe204813178e3c45f1 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -59,7 +59,7 @@ static const char *cpu_type;
 static const char *seed_optarg;
 unsigned long mmap_min_addr;
 unsigned long guest_base;
-int have_guest_base;
+bool have_guest_base;
 
 /*
  * Used to implement backwards-compatibility for the `-strace`, and
@@ -334,7 +334,7 @@ static void handle_arg_cpu(const char *arg)
 static void handle_arg_guest_base(const char *arg)
 {
     guest_base = strtol(arg, NULL, 0);
-    have_guest_base = 1;
+    have_guest_base = true;
 }
 
 static void handle_arg_reserved_va(const char *arg)