diff --git a/Makefile.config.in b/Makefile.config.in
index b383e60c..a9f14963 100644
--- a/Makefile.config.in
+++ b/Makefile.config.in
@@ -117,7 +117,7 @@ CONFIG_DOM = @CONFIG_DOM@
 CONFIG_ECMASCRIPT = @CONFIG_ECMASCRIPT@
 CONFIG_ECMASCRIPT_SEE = @CONFIG_ECMASCRIPT_SEE@
 CONFIG_ECMASCRIPT_SMJS = @CONFIG_ECMASCRIPT_SMJS@
-CONFIG_ECMASCRIPT_SMJS_HEARTBEAT = @CONFIG_ECMASCRIPT_SMJS@
+CONFIG_ECMASCRIPT_SMJS_HEARTBEAT = @CONFIG_ECMASCRIPT_SMJS_HEARTBEAT@
 CONFIG_EXMODE = @CONFIG_EXMODE@
 CONFIG_FASTMEM = @CONFIG_FASTMEM@
 CONFIG_FINGER = @CONFIG_FINGER@