diff --git a/src/unix/fontenum.cpp b/src/unix/fontenum.cpp
index 01d4a61a75..f28eca94df 100644
--- a/src/unix/fontenum.cpp
+++ b/src/unix/fontenum.cpp
@@ -62,6 +62,10 @@ wxCompareFamilies (const void *a, const void *b)
 bool wxFontEnumerator::EnumerateFacenames(wxFontEncoding encoding,
                                           bool fixedWidthOnly)
 {
+    // This parameter may be unused when pango_font_family_is_monospace() is
+    // not available, suppress the (unavoidable) warning in this case.
+    wxUnusedVar(fixedWidthOnly);
+
     if ( encoding != wxFONTENCODING_SYSTEM && encoding != wxFONTENCODING_UTF8 )
     {
         // Pango supports only UTF-8 encoding (and system means any, so we