diff --git a/plugins/game b/plugins/game
old mode 100644
new mode 100755
diff --git a/plugins/grandtotal b/plugins/grandtotal
old mode 100644
new mode 100755
diff --git a/plugins/pfand b/plugins/pfand
old mode 100644
new mode 100755
index cc505ce..bbe4dc2
--- a/plugins/pfand
+++ b/plugins/pfand
@@ -1,3 +1,5 @@
+#!perl
+
 HELP "pfand" => "Pfand zurueck";
 
 # This is a demo plugin. It's called "pfand" because "deposit" would be
diff --git a/plugins/repeat b/plugins/repeat
old mode 100644
new mode 100755
index da10f0a..f69958b
--- a/plugins/repeat
+++ b/plugins/repeat
@@ -1,3 +1,5 @@
+#!perl
+
 my $err_stacked = "Stacked repetition is not supported.";
 my $err_multi = "Repetition not supported in multi-user transactions.";
 my $err_pfand = "Plugins 'pfand' and 'repeat' cannot be combined.";
diff --git a/plugins/stock b/plugins/stock
old mode 100644
new mode 100755
diff --git a/plugins/voorbeeld b/plugins/voorbeeld
old mode 100644
new mode 100755
index d3381bd..1e82e40
--- a/plugins/voorbeeld
+++ b/plugins/voorbeeld
@@ -1,3 +1,5 @@
+#!perl
+
 sub command { print "@_\n"; NEXT }