diff --git a/Documentation/Doxyfile.in b/Documentation/Doxyfile.in
index 87959e23ce28..4bbacc464a5e 100644
--- a/Documentation/Doxyfile.in
+++ b/Documentation/Doxyfile.in
@@ -39,7 +39,7 @@ PROJECT_NAME           = "libcamera"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = @VERSION@
+PROJECT_NUMBER         = "@VERSION@"
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a