diff --git a/pkgs/build-support/build-graalvm-native-image/default.nix b/pkgs/build-support/build-graalvm-native-image/default.nix
index e25a71405089..6a5e82427f7b 100644
--- a/pkgs/build-support/build-graalvm-native-image/default.nix
+++ b/pkgs/build-support/build-graalvm-native-image/default.nix
@@ -3,7 +3,6 @@
 , glibcLocales
   # The GraalVM derivation to use
 , graalvmDrv
-, name ? "${args.pname}-${args.version}"
 , executable ? args.pname
   # JAR used as input for GraalVM derivation, defaults to src
 , jar ? args.src
@@ -15,13 +14,13 @@
     "-H:Name=${executable}"
     "-march=compatibility"
     "--verbose"
+    "-J-Dsun.stdout.encoding=UTF-8"
+    "-J-Dsun.stderr.encoding=UTF-8"
   ]
   # Extra arguments to be passed to the native-image
 , extraNativeImageBuildArgs ? [ ]
   # XMX size of GraalVM during build
 , graalvmXmx ? "-J-Xmx6g"
-  # Locale to be used by GraalVM compiler
-, LC_ALL ? "en_US.UTF-8"
 , meta ? { }
 , ...
 } @ args:
@@ -41,7 +40,7 @@ let
   ];
 in
 stdenv.mkDerivation ({
-  inherit dontUnpack LC_ALL jar;
+  inherit dontUnpack jar;
 
   nativeBuildInputs = (args.nativeBuildInputs or [ ]) ++ [ graalvmDrv glibcLocales ];
 
diff --git a/pkgs/development/interpreters/babashka/default.nix b/pkgs/development/interpreters/babashka/default.nix
index 4c4cfd67dcdc..7f8281dd1de2 100644
--- a/pkgs/development/interpreters/babashka/default.nix
+++ b/pkgs/development/interpreters/babashka/default.nix
@@ -33,9 +33,10 @@ let
     doInstallCheck = true;
 
     installCheckPhase = ''
-      $out/bin/bb --version | grep '${version}'
-      $out/bin/bb '(+ 1 2)' | grep '3'
-      $out/bin/bb '(vec (dedupe *input*))' <<< '[1 1 1 1 2]' | grep '[1 2]'
+      $out/bin/bb --version | fgrep '${version}'
+      $out/bin/bb '(+ 1 2)' | fgrep '3'
+      $out/bin/bb '(vec (dedupe *input*))' <<< '[1 1 1 1 2]' | fgrep '[1 2]'
+      $out/bin/bb '(prn "bépo àê")' | fgrep 'bépo àê'
     '';
 
     # As of v1.2.174, this will remove references to ${graalvmDrv}/conf/chronology,