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-rw-r--r--gnu/build/image.scm5
1 files changed, 4 insertions, 1 deletions
diff --git a/gnu/build/image.scm b/gnu/build/image.scm
index 2332b72b17..e6cc2d0640 100644
--- a/gnu/build/image.scm
+++ b/gnu/build/image.scm
@@ -178,7 +178,10 @@ ROOT directory to populate the image."
(case format
((compressed-qcow2)
(invoke "qemu-img" "convert" "-c" "-f" "raw"
- "-O" "qcow2" image output))
+ ;; The maximum number of co-routines is 16.
+ "-m" (number->string (min 16 (parallel-job-count)))
+ "-O" "qcow2"
+ image output))
(else
(copy-file image output))))