diff --git a/libexslt/libexslt.h b/libexslt/libexslt.h
index 29575460..af68f7d4 100644
--- a/libexslt/libexslt.h
+++ b/libexslt/libexslt.h
@@ -26,4 +26,10 @@
 #endif
 #endif
 
+#ifdef __GNUC__
+#define ATTRIBUTE_UNUSED __attribute__((unused))
+#else
+#define ATTRIBUTE_UNUSED
+#endif
+
 #endif /* ! __XSLT_LIBEXSLT_H__ */
diff --git a/libxslt/libxslt.h b/libxslt/libxslt.h
index 2b0c8b09..deb89e69 100644
--- a/libxslt/libxslt.h
+++ b/libxslt/libxslt.h
@@ -33,4 +33,10 @@
 #define mkdir(p,m) _mkdir(p)
 #endif
 
+#ifdef __GNUC__
+#define ATTRIBUTE_UNUSED __attribute__((unused))
+#else
+#define ATTRIBUTE_UNUSED
+#endif
+
 #endif /* ! __XSLT_LIBXSLT_H__ */
diff --git a/libxslt/xsltconfig.h.in b/libxslt/xsltconfig.h.in
index c595b6ee..c05e41fb 100644
--- a/libxslt/xsltconfig.h.in
+++ b/libxslt/xsltconfig.h.in
@@ -115,19 +115,6 @@ extern "C" {
 #define LIBXSLT_DEFAULT_PLUGINS_PATH() "@LIBXSLT_DEFAULT_PLUGINS_PATH@"
 #endif
 
-/**
- * ATTRIBUTE_UNUSED:
- *
- * This macro is used to flag unused function parameters to GCC
- */
-#ifdef __GNUC__
-#ifndef ATTRIBUTE_UNUSED
-#define ATTRIBUTE_UNUSED __attribute__((unused))
-#endif
-#else
-#define ATTRIBUTE_UNUSED
-#endif
-
 /**
  * LIBXSLT_ATTR_FORMAT:
  *
diff --git a/python/libxslt_wrap.h b/python/libxslt_wrap.h
index 04b6c3c3..94ca47b7 100644
--- a/python/libxslt_wrap.h
+++ b/python/libxslt_wrap.h
@@ -19,6 +19,12 @@
 #include <libxslt/variables.h>
 #include <libxslt/xsltconfig.h>
 
+#ifdef __GNUC__
+#define ATTRIBUTE_UNUSED __attribute__((unused))
+#else
+#define ATTRIBUTE_UNUSED
+#endif
+
 #define Pystylesheet_Get(v) (((v) == Py_None) ? NULL : \
         (((Pystylesheet_Object *)(v))->obj))
 
diff --git a/tests/fuzz/fuzz.h b/tests/fuzz/fuzz.h
index 3ff81ca6..8c8cc2c3 100644
--- a/tests/fuzz/fuzz.h
+++ b/tests/fuzz/fuzz.h
@@ -11,6 +11,12 @@
 #include <libxml/xmlstring.h>
 #include <libxml/xpath.h>
 
+#ifdef __GNUC__
+#define ATTRIBUTE_UNUSED __attribute__((unused))
+#else
+#define ATTRIBUTE_UNUSED
+#endif
+
 int
 LLVMFuzzerInitialize(int *argc, char ***argv);