diff --git a/Lib/clisp/clisp.swg b/Lib/clisp/clisp.swg
index 322f399f5..95410e0fe 100644
--- a/Lib/clisp/clisp.swg
+++ b/Lib/clisp/clisp.swg
@@ -25,4 +25,4 @@
 %typemap(in) unsigned long "ffi:ulong";
 
 %typemap(in) float "SINGLE-FLOAT";
-%typemap(in) double "DOUBLE_FLOAT";
+%typemap(in) double "DOUBLE-FLOAT";