diff --git a/qemu-thread-posix.c b/qemu-thread-posix.c
index 9e1b5fbdaa0171e233ef156ac536617510f92274..8fbabdac36442e629c7e0f1a17350f9b71d2e222 100644
--- a/qemu-thread-posix.c
+++ b/qemu-thread-posix.c
@@ -151,7 +151,7 @@ void qemu_thread_get_self(QemuThread *thread)
     thread->thread = pthread_self();
 }
 
-int qemu_thread_is_self(QemuThread *thread)
+bool qemu_thread_is_self(QemuThread *thread)
 {
    return pthread_equal(pthread_self(), thread->thread);
 }
diff --git a/qemu-thread-win32.c b/qemu-thread-win32.c
index 3524c8b785a4cb4a29798464143eb7fe629cb704..177b398cc4fe87de9abbe5293da3a5f98c17455e 100644
--- a/qemu-thread-win32.c
+++ b/qemu-thread-win32.c
@@ -330,7 +330,7 @@ HANDLE qemu_thread_get_handle(QemuThread *thread)
     return handle;
 }
 
-int qemu_thread_is_self(QemuThread *thread)
+bool qemu_thread_is_self(QemuThread *thread)
 {
     return GetCurrentThreadId() == thread->tid;
 }
diff --git a/qemu-thread.h b/qemu-thread.h
index a78a8f2524bf9affd5a476433b0bc2f69e6ccb53..05fdaaf50e4209ad62ea216a6c1e39ab86f0fdb6 100644
--- a/qemu-thread.h
+++ b/qemu-thread.h
@@ -2,6 +2,7 @@
 #define __QEMU_THREAD_H 1
 
 #include <inttypes.h>
+#include <stdbool.h>
 
 typedef struct QemuMutex QemuMutex;
 typedef struct QemuCond QemuCond;
@@ -42,7 +43,7 @@ void qemu_thread_create(QemuThread *thread,
                         void *arg, int mode);
 void *qemu_thread_join(QemuThread *thread);
 void qemu_thread_get_self(QemuThread *thread);
-int qemu_thread_is_self(QemuThread *thread);
+bool qemu_thread_is_self(QemuThread *thread);
 void qemu_thread_exit(void *retval);
 
 #endif