diff --git a/tcl/Util.tcl b/tcl/Util.tcl
index 49028698..dc038e44 100644
--- a/tcl/Util.tcl
+++ b/tcl/Util.tcl
@@ -209,9 +209,9 @@ proc sta_warn { msg_id msg } {
 proc sta_error { msg_id msg } {
   if { ! [is_suppressed $msg_id] } {
     if { [sdc_filename] != "" } {
-      error "Error: [file tail [sdc_filename]] line [sdc_file_line], $msg"
+      error "Error $msg_id: [file tail [sdc_filename]] line [sdc_file_line], $msg"
     } else {
-      error "Error: $msg"
+      error "Error $msg_id: $msg"
     }
   }
 }
diff --git a/util/Report.cc b/util/Report.cc
index f2d0955d..0d8dac77 100644
--- a/util/Report.cc
+++ b/util/Report.cc
@@ -247,7 +247,7 @@ Report::error(int id,
   va_list args;
   va_start(args, fmt);
   // No prefix msg, no \n.
-  printToBuffer("%d", id);
+  printToBuffer("%d ", id);
   printToBufferAppend(fmt, args);
   va_end(args);
   throw ExceptionMsg(buffer_, isSuppressed(id));
@@ -259,7 +259,7 @@ Report::verror(int id,
                va_list args)
 {
   // No prefix msg, no \n.
-  printToBuffer("%d", id);
+  printToBuffer("%d ", id);
   printToBufferAppend(fmt, args);
   throw ExceptionMsg(buffer_, isSuppressed(id));
 }