diff --git a/scripts/cmake/DocumentationSetup.cmake b/scripts/cmake/DocumentationSetup.cmake
index 25ae1d1860505e495c6f900dfc5724ccd370e544..777cb52760fbe5ad471c24365b266c40bcf8ba67 100644
--- a/scripts/cmake/DocumentationSetup.cmake
+++ b/scripts/cmake/DocumentationSetup.cmake
@@ -49,7 +49,7 @@ doxygen_add_docs(doc
     ${PROJECT_SOURCE_DIR}/
     ${PROJECT_BINARY_DIR}/DocAux/dox)
 
-if (BASH_TOOL_PATH AND PYTHON_EXECUTABLE)
+if (BASH_TOOL_PATH AND Python_EXECUTABLE)
     set(doc_use_external_tools TRUE)
 else()
     set(doc_use_external_tools FALSE)