diff --git a/test/gpu/native/studies/minibude/Bude.prediff b/test/gpu/native/studies/minibude/Bude.prediff
index d18dd2beb5e9..a60f1bc6ad92 100755
--- a/test/gpu/native/studies/minibude/Bude.prediff
+++ b/test/gpu/native/studies/minibude/Bude.prediff
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 
 # filter number of gpus run on from output
-cat $2 | sed 's/Running Chapel on [0-9]\+ GPUs\{0,1\}/Running Chapel on NN GPUs/' > $2.prediff.tmp
+cat $2 | sed 's/Running Chapel on [0-9]\{1,\} GPUs\{0,1\}/Running Chapel on NN GPUs/' > $2.prediff.tmp
 mv $2.prediff.tmp $2