diff --git a/v1/bootstrap.jam b/v1/bootstrap.jam
index a4ea30696..d83f7aed4 100644
--- a/v1/bootstrap.jam
+++ b/v1/bootstrap.jam
@@ -3,6 +3,13 @@
 #  all copies. This software is provided "as is" without express or implied
 #  warranty, and with no claim as to its suitability for any purpose.
 
+#
+# Enforce toolset names to be lowercase for consistency. This also
+# removes bugs for incompatible names on file systems that are
+# case-insensitive.
+#
+TOOLS = $(TOOLS:L) ;
+
 SEARCH on <jam-module>allyourbase.jam = $(BOOST_BUILD_PATH) ;
 include <jam-module>allyourbase.jam ;
 SEARCH on <jam-module>boost-base.jam = $(BOOST_BUILD_PATH) ;