diff --git a/fuzz/fuzz.h b/fuzz/fuzz.h
index 1a155cdd..75249c4f 100644
--- a/fuzz/fuzz.h
+++ b/fuzz/fuzz.h
@@ -15,7 +15,7 @@
 extern "C" {
 #endif
 
-#if __GNUC__ * 100 + __GNUC_MINOR__ >= 207
+#if __GNUC__ * 100 + __GNUC_MINOR__ >= 207 || defined(__clang__)
   #define ATTRIBUTE_UNUSED __attribute__((unused))
 #else
   #define ATTRIBUTE_UNUSED
diff --git a/libxml.h b/libxml.h
index 9fc5033f..e1aa3ee4 100644
--- a/libxml.h
+++ b/libxml.h
@@ -47,7 +47,7 @@
   #define XML_HIDDEN
 #endif
 
-#if __GNUC__ * 100 + __GNUC_MINOR__ >= 207
+#if __GNUC__ * 100 + __GNUC_MINOR__ >= 207 || defined(__clang__)
   #define ATTRIBUTE_UNUSED __attribute__((unused))
 #else
   #define ATTRIBUTE_UNUSED
diff --git a/python/libxml_wrap.h b/python/libxml_wrap.h
index 23a31d69..1908b26f 100644
--- a/python/libxml_wrap.h
+++ b/python/libxml_wrap.h
@@ -50,7 +50,7 @@
  * Repeated here since the definition is not available when
  * compiled outside the libxml2 build tree.
  */
-#ifdef __GNUC__
+#if defined(__GNUC__) || defined(__clang__)
 #ifdef ATTRIBUTE_UNUSED
 #undef ATTRIBUTE_UNUSED
 #endif