diff --git a/urjtag/ChangeLog b/urjtag/ChangeLog
index da62d4f3..fa719ceb 100644
--- a/urjtag/ChangeLog
+++ b/urjtag/ChangeLog
@@ -4,6 +4,9 @@
 
   * include/urjtag/parse.h: Document the various stream functions.
 
+  * include/urjtag/parse.h (urj_parse_line): Constify the "line" argument.
+  * src/global/parse.c (urj_parse_line): Likewise.
+
 2011-02-17  Mike Frysinger  <vapier@gentoo.org>
 
   * data/analog/bf548/STEPPINGS: Add bf54x-0.4 support.
diff --git a/urjtag/include/urjtag/parse.h b/urjtag/include/urjtag/parse.h
index 3b5bb88e..141a882b 100644
--- a/urjtag/include/urjtag/parse.h
+++ b/urjtag/include/urjtag/parse.h
@@ -37,7 +37,7 @@
  *      URJ_STATUS_ERROR on error
  *      URJ_STATUS_QUIT on quit command
  */
-int urj_parse_line (urj_chain_t *chain, char *line);
+int urj_parse_line (urj_chain_t *chain, const char *line);
 
 /**
  * Run each line in the specified stream through urj_parse_line().
diff --git a/urjtag/src/global/parse.c b/urjtag/src/global/parse.c
index 387eabfa..6d84cfb6 100644
--- a/urjtag/src/global/parse.c
+++ b/urjtag/src/global/parse.c
@@ -45,12 +45,13 @@
 
 
 int
-urj_parse_line (urj_chain_t *chain, char *line)
+urj_parse_line (urj_chain_t *chain, const char *line)
 {
     int l, i, r, tcnt;
     int escape = 0, quote_single = 0, quote_double = 0;
     char **a;
-    char *c, *d;
+    const char *c;
+    char *d;
     char *sline;
 
     if (line == NULL)