diff --git a/builder/index-parse.y b/builder/index-parse.y
index 06e6a838b..36f9f07e3 100644
--- a/builder/index-parse.y
+++ b/builder/index-parse.y
@@ -153,8 +153,8 @@ yyerror (YYLTYPE * yylloc, yyscan_t scanner, struct parse_context *context, cons
   int has_suffix = context->error_suffix != NULL && context->error_suffix[0] != 0;
 
   fprintf (stderr, "%s%s%s%ssyntax error at line %d: %s%s%s\n",
-           context->program_name ? context->program_name : "",
-           context->program_name ? ": " : "",
+           context->progname ? context->progname : "",
+           context->progname ? ": " : "",
            context->input_file ? context->input_file : "",
            context->input_file ? ": " : "",
            yylloc->first_line, msg,
diff --git a/builder/index-parser-c.c b/builder/index-parser-c.c
index 099bdf86d..845abd7d5 100644
--- a/builder/index-parser-c.c
+++ b/builder/index-parser-c.c
@@ -56,7 +56,7 @@ virt_builder_parse_index (value progv, value error_suffixv, value filenamev)
   FILE *in;
 
   parse_context_init (&context);
-  context.program_name = String_val (progv);
+  context.progname = String_val (progv);
   context.input_file = String_val (filenamev);
   context.error_suffix = String_val (error_suffixv);
 
diff --git a/builder/index-struct.h b/builder/index-struct.h
index 150535d3a..ada35e3d7 100644
--- a/builder/index-struct.h
+++ b/builder/index-struct.h
@@ -44,7 +44,7 @@ struct parse_context {
    */
   int seen_comments;
   const char *input_file;
-  const char *program_name;
+  const char *progname;
   const char *error_suffix;
 };