diff --git a/docs/CMakeLists.txt b/docs/CMakeLists.txt
index 629c1644..ffa7768e 100644
--- a/docs/CMakeLists.txt
+++ b/docs/CMakeLists.txt
@@ -50,7 +50,7 @@ else()
                        COMMENT "Generating HTML documentation"
                        VERBATIM)
 
-    add_custom_target(docs ALL DEPENDS "html/index.html")
+    add_custom_target(docs ALL SOURCES ${source_files} DEPENDS "html/index.html")
     set_target_properties(docs PROPERTIES FOLDER "GLFW3")
 
     if (GLFW_INSTALL)