diff --git a/pkgs/development/compilers/dotnet/update.sh b/pkgs/development/compilers/dotnet/update.sh
index 971ae38879f0..ad51bcaf31da 100755
--- a/pkgs/development/compilers/dotnet/update.sh
+++ b/pkgs/development/compilers/dotnet/update.sh
@@ -247,7 +247,7 @@ update() {
         return 1
     fi
 
-    : ${output:="$(dirname "${BASH_SOURCE[0]}")"/versions/$sem_version.nix}
+    : ${output:="$(realpath "$(dirname "${BASH_SOURCE[0]}")")"/versions/$sem_version.nix}
     echo "Generating $output"
 
     # Make sure the x.y version is properly passed to .NET release metadata url.