diff --git a/jtag/ChangeLog b/jtag/ChangeLog
index d655f935..f0ac4d49 100644
--- a/jtag/ChangeLog
+++ b/jtag/ChangeLog
@@ -1,3 +1,8 @@
+2008-04-19  Kolja Waschk <kawk>
+
+   * src/cmd/frequency.c: ensure that cable is initialized. Fixes
+     [ 1933736 ] "frequency" command segfaults without args
+
 2008-04-19  Arnim Laeuger  <arniml@users.sourceforge.net>
 
    * src/bsdl/Makefile.am, src/svf/Makefile.am: ensure that
diff --git a/jtag/src/cmd/frequency.c b/jtag/src/cmd/frequency.c
index 23e9d7ee..e0a857c5 100644
--- a/jtag/src/cmd/frequency.c
+++ b/jtag/src/cmd/frequency.c
@@ -36,6 +36,9 @@ cmd_frequency_run( chain_t *chain, char *params[] )
 {
 	unsigned int freq;
 
+	if (!cmd_test_cable( chain ))
+		return 1;
+
 	if (cmd_params( params ) == 1) {
 		printf( _("Current TCK frequency is %u Hz\n"), cable_get_frequency(chain->cable) );
 		return 1;