diff --git a/tests/fuzz/fuzzer_platform.c b/tests/fuzz/fuzzer_platform.c
index 23427876e..4ab2ac997 100644
--- a/tests/fuzz/fuzzer_platform.c
+++ b/tests/fuzz/fuzzer_platform.c
@@ -84,7 +84,7 @@ void otPlatRadioSetPanId(otInstance *aInstance, uint16_t aPanId)
     (void)aPanId;
 }
 
-void otPlatRadioSetExtendedAddress(otInstance *aInstance, otExtAddress *aExtAddr)
+void otPlatRadioSetExtendedAddress(otInstance *aInstance, const otExtAddress *aExtAddr)
 {
     (void)aInstance;
     (void)aExtAddr;