diff --git a/app/masterhook.c b/app/masterhook.c
index aea028f3..06c63a52 100644
--- a/app/masterhook.c
+++ b/app/masterhook.c
@@ -19,6 +19,7 @@
 #include <dlfcn.h>
 #include <unistd.h>
 #include <errno.h>
+#include <stdbool.h>
 #include <sys/stat.h>
 
 #include <xf86drm.h>
diff --git a/app/masterhook_internal.c b/app/masterhook_internal.c
index 6f9ae228..f284fd17 100644
--- a/app/masterhook_internal.c
+++ b/app/masterhook_internal.c
@@ -9,6 +9,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
+#include <stdbool.h>
 #include <sys/stat.h>
 
 #include <xf86drm.h>