diff --git a/bin/find-undocumented-classes b/bin/find-undocumented-classes
index 3040660eefa0..8bab72bc977c 100755
--- a/bin/find-undocumented-classes
+++ b/bin/find-undocumented-classes
@@ -2,6 +2,8 @@
 
 # finds undocumented classes in the current directory (recursive)
 
+type -p doxygen >/dev/null || exit
+
 filter=
 quiet=n
 if [ "$1" = "-q" ]; then