diff --git a/CMakeLists.txt b/CMakeLists.txt
index bc915f8..fee3cbe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -293,7 +293,7 @@ function(use_townengine target sources output_directory data_dir)
                          "#!/bin/env sh"
                          "cd \"$(dirname \"$0\")\""
                          "export LD_LIBRARY_PATH=./"
-                         "if [ \$1 = \"gdb\" ]; then"
+                         "if [ \"\$1\" = \"gdb\" ]; then"
                          "    unset DEBUGINFOD_URLS"
                          "    gdb -ex run --args ./launcher ${TWN_BOOTSTRAP_EXEC_ARGS}"
                          "else"