diff --git a/src/doxygen.config b/src/doxygen.config
index 2970a10b..917788cd 100644
--- a/src/doxygen.config
+++ b/src/doxygen.config
@@ -74,7 +74,7 @@ ALIASES                =
 
 TCL_SUBST              =
 
-OPTIMIZE_OUTPUT_FOR_C  = YES.
+OPTIMIZE_OUTPUT_FOR_C  = YES
 
 OPTIMIZE_OUTPUT_JAVA   = NO