1 files changed, 3 insertions, 1 deletions

diff --git a/ymir.nix b/ymir.nix
index 2b94f31c..80580442 100644
--- a/ymir.nix
+++ b/ymir.nix
@@ -90,7 +90,9 @@ in rec {
 
         TRAPEXIT() { [[ -n "''${tmpFile}" && -e "''${tmpFile}" ]] && rm -f "''${tmpFile}" }
 
-        prefix=$(tee "''${tmpFile}" | sha512sum | awk '{ print $1; }' | head -c 10)
+        cat >! "''${tmpFile}"
+
+        prefix=$(sha512sum "''${tmpFile}" | awk '{ print $1; }' | head -c 10)
         prefix=''${prefix:l}
         filename="$1"