diff --git a/eo/build_gcc_linux_unittest b/eo/build_gcc_linux_unittest
index 36220ba0..c23049e8 100755
--- a/eo/build_gcc_linux_unittest
+++ b/eo/build_gcc_linux_unittest
@@ -1,6 +1,6 @@
 #!/usr/bin/env sh
 
-mkdir debug
+mkdir -p debug
 cd debug
 cmake -DCMAKE_BUILD_TYPE=Debug -DENABLE_CMAKE_TESTING=1 ..
 make