diff --git a/pkg/openthread/contrib/platform_logging.c b/pkg/openthread/contrib/platform_logging.c
index a3aed1db7d..a7deade082 100644
--- a/pkg/openthread/contrib/platform_logging.c
+++ b/pkg/openthread/contrib/platform_logging.c
@@ -28,6 +28,7 @@
 
 /* adapted from OpenThread posix example:
  * See: https://github.com/openthread/openthread/blob/master/examples/platforms/posix/logging.c */
+__attribute__((__format__ (__printf__, 3, 4)))
 void otPlatLog(otLogLevel aLogLevel, otLogRegion aLogRegion, const char *aFormat, ...)
 {
     va_list args;