diff --git a/tcl/cpld/altera-epm240.cfg b/tcl/cpld/altera-epm240.cfg
index 6e10188ca..ece02bbef 100644
--- a/tcl/cpld/altera-epm240.cfg
+++ b/tcl/cpld/altera-epm240.cfg
@@ -17,3 +17,7 @@ jtag newtap $_CHIPNAME tap -irlen 10 \
 	-expected-id 0x020a40dd \
 	-expected-id 0x020a50dd \
 	-expected-id 0x020a60dd
+
+# 200ns seems like a good speed
+# c.f. Table 5-34: MAX II JTAG Timing Parameters
+adapter speed 5000