diff --git a/src/etc/rust-gdb b/src/etc/rust-gdb
index 6835d6aa90874..743952a5bef89 100755
--- a/src/etc/rust-gdb
+++ b/src/etc/rust-gdb
@@ -20,7 +20,7 @@ GDB_PYTHON_MODULE_DIRECTORY="$RUSTC_SYSROOT/lib/rustlib/etc"
 # Set the environment variable `RUST_GDB` to overwrite the call to a
 # different/specific command (defaults to `gdb`).
 RUST_GDB="${RUST_GDB:-gdb}"
-PYTHONPATH="$PYTHONPATH:$GDB_PYTHON_MODULE_DIRECTORY" ${RUST_GDB} \
+PYTHONPATH="$PYTHONPATH:$GDB_PYTHON_MODULE_DIRECTORY" exec ${RUST_GDB} \
   --directory="$GDB_PYTHON_MODULE_DIRECTORY" \
   -iex "add-auto-load-safe-path $GDB_PYTHON_MODULE_DIRECTORY" \
   "$@"
diff --git a/src/etc/rust-lldb b/src/etc/rust-lldb
index f70ab65bce717..6a2849b55485e 100755
--- a/src/etc/rust-lldb
+++ b/src/etc/rust-lldb
@@ -23,19 +23,16 @@ display the contents of local variables!"
     echo "***"
 fi
 
-# Create a tempfile containing the LLDB script we want to execute on startup
-TMPFILE=`mktemp /tmp/rust-lldb-commands.XXXXXX`
-
-# Make sure to delete the tempfile no matter what
-trap "rm -f $TMPFILE; exit" INT TERM EXIT
-
 # Find out where to look for the pretty printer Python module
 RUSTC_SYSROOT=`rustc --print sysroot`
 
-# Write the LLDB script to the tempfile
-echo "command script import \"$RUSTC_SYSROOT/lib/rustlib/etc/lldb_rust_formatters.py\"" >> $TMPFILE
-echo "type summary add --no-value --python-function lldb_rust_formatters.print_val -x \".*\" --category Rust" >> $TMPFILE
-echo "type category enable Rust" >> $TMPFILE
+# Prepare commands that will be loaded before any file on the command line has been loaded
+script_import="command script import \"$RUSTC_SYSROOT/lib/rustlib/etc/lldb_rust_formatters.py\""
+category_definition="type summary add --no-value --python-function lldb_rust_formatters.print_val -x \".*\" --category Rust"
+category_enable="type category enable Rust"
 
-# Call LLDB with the script added to the argument list
-lldb --source-before-file="$TMPFILE" "$@"
+# Call LLDB with the commands added to the argument list
+exec lldb --one-line-before-file="$script_import" \
+    --one-line-before-file="$category_definition" \
+    --one-line-before-file="$category_enable" \
+    "$@"