diff --git a/src/libinput.c b/src/libinput.c
index 69580429..6ad497e1 100644
--- a/src/libinput.c
+++ b/src/libinput.c
@@ -159,6 +159,7 @@ struct libinput_event_tablet_pad {
 	} strip;
 };
 
+LIBINPUT_ATTRIBUTE_PRINTF(3, 0)
 static void
 libinput_default_log_func(struct libinput *libinput,
 			  enum libinput_log_priority priority,
diff --git a/test/litest.c b/test/litest.c
index 4c301b58..fd62d214 100644
--- a/test/litest.c
+++ b/test/litest.c
@@ -263,6 +263,7 @@ litest_backtrace(void)
 }
 #endif
 
+LIBINPUT_ATTRIBUTE_PRINTF(5, 6)
 void
 litest_fail_condition(const char *file,
 		      int line,
@@ -756,6 +757,7 @@ _litest_add_ranged_for_device(const char *name,
 		litest_abort_msg("Invalid test device type");
 }
 
+LIBINPUT_ATTRIBUTE_PRINTF(3, 0)
 static void
 litest_log_handler(struct libinput *libinput,
 		   enum libinput_log_priority pri,
diff --git a/test/misc.c b/test/misc.c
index 791ebc37..582d4fcf 100644
--- a/test/misc.c
+++ b/test/misc.c
@@ -847,6 +847,7 @@ const struct libinput_interface leak_interface = {
 	.close_restricted = close_restricted_leak,
 };
 
+LIBINPUT_ATTRIBUTE_PRINTF(3, 0)
 static void
 simple_log_handler(struct libinput *libinput,
 		   enum libinput_log_priority priority,
diff --git a/tools/event-gui.c b/tools/event-gui.c
index b67ca452..b5dd097c 100644
--- a/tools/event-gui.c
+++ b/tools/event-gui.c
@@ -108,6 +108,7 @@ struct window {
 	struct libinput_device *devices[50];
 };
 
+LIBINPUT_ATTRIBUTE_PRINTF(1, 2)
 static int
 error(const char *fmt, ...)
 {
@@ -121,6 +122,7 @@ error(const char *fmt, ...)
 	return EXIT_FAILURE;
 }
 
+LIBINPUT_ATTRIBUTE_PRINTF(1, 2)
 static void
 msg(const char *fmt, ...)
 {
diff --git a/tools/shared.c b/tools/shared.c
index 95655ba7..3ab4b68f 100644
--- a/tools/shared.c
+++ b/tools/shared.c
@@ -65,6 +65,7 @@ enum options {
 	OPT_PROFILE,
 };
 
+LIBINPUT_ATTRIBUTE_PRINTF(3, 0)
 static void
 log_handler(struct libinput *li,
 	    enum libinput_log_priority priority,