diff --git a/include/hermit/config.h.in b/include/hermit/config.h.in
index 60a04870f..2c9e9c9ec 100644
--- a/include/hermit/config.h.in
+++ b/include/hermit/config.h.in
@@ -4,6 +4,7 @@
 #cmakedefine KERNEL_STACK_SIZE	(@KERNEL_STACK_SIZE@)
 #cmakedefine DEFAULT_STACK_SIZE	(@DEFAULT_STACK_SIZE@)
 #cmakedefine PACKAGE_VERSION 	"@PACKAGE_VERSION@"
+#cmakedefine MAX_FNAME			(@MAX_FNAME@)
 
 #cmakedefine SAVE_FPU