diff --git a/doxygen/doxygen.config.in b/doxygen/doxygen.config.in
index 077f4fb4d..8c130fa6f 100644
--- a/doxygen/doxygen.config.in
+++ b/doxygen/doxygen.config.in
@@ -38,7 +38,7 @@ PROJECT_NAME           = "AWS Encryption SDK for C"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = v$(MAJOR).$(MINOR)
+PROJECT_NUMBER         = v$(MAJOR).$(MINOR).$(PATCH)
 
 # 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