diff --git a/imgsrv/cgi/download b/imgsrv/cgi/download
index e00827915..87cec6379 100755
--- a/imgsrv/cgi/download
+++ b/imgsrv/cgi/download
@@ -8,7 +8,8 @@ use strict;
 use warnings;
 
 BEGIN {
-   # $ENV{DEBUG_LOCAL} = 1;
+    $ENV{PLACK_ENV} = ( defined $ENV{HT_DEV} ) ? 'development' : 'production';
+    # $ENV{DEBUG_LOCAL} = 1;
 }
 
 use Plack::Util;
diff --git a/imgsrv/cgi/imgsrv b/imgsrv/cgi/imgsrv
index 7dbb0f4b1..0995885ec 100755
--- a/imgsrv/cgi/imgsrv
+++ b/imgsrv/cgi/imgsrv
@@ -9,6 +9,7 @@ use Vendors __FILE__;
 # ----------------------------------------------------------------------
 # ----------------------------------------------------------------------
 BEGIN {
+    $ENV{PLACK_ENV} = ( defined $ENV{HT_DEV} ) ? 'development' : 'production';
     # Set the SDRINST and SDRLIB environment variables in auth
     # system absence.
     require Auth::Surrogate;