diff --git a/justfile b/justfile
index 6b057fe9..2ce7833b 100755
--- a/justfile
+++ b/justfile
@@ -10,6 +10,9 @@ log := "warn"
 
 export JUST_LOG := log
 
+watch +args='test':
+  cargo watch --clear --exec '{{ args }}'
+
 test:
   cargo test
 
@@ -36,9 +39,6 @@ build:
 fmt:
   cargo fmt --all
 
-watch +COMMAND='test':
-  cargo watch --clear --exec "{{COMMAND}}"
-
 man:
   cargo build --features help4help2man
   help2man \
diff --git a/src/recipe.rs b/src/recipe.rs
index 01aa273f..30e9d9ed 100644
--- a/src/recipe.rs
+++ b/src/recipe.rs
@@ -306,7 +306,7 @@ impl<'src, D> Recipe<'src, D> {
     })?;
 
     let mut tempdir_builder = tempfile::Builder::new();
-    tempdir_builder.prefix("just");
+    tempdir_builder.prefix("just-");
     let tempdir = match &context.settings.tempdir {
       Some(tempdir) => tempdir_builder.tempdir_in(context.search.working_directory.join(tempdir)),
       None => tempdir_builder.tempdir(),