diff --git a/tools/cooja/apps/mrm/.cvsignore b/tools/cooja/apps/mrm/.cvsignore
new file mode 100644
index 000000000..378eac25d
--- /dev/null
+++ b/tools/cooja/apps/mrm/.cvsignore
@@ -0,0 +1 @@
+build
diff --git a/tools/cooja/apps/mspsim/.cvsignore b/tools/cooja/apps/mspsim/.cvsignore
new file mode 100644
index 000000000..378eac25d
--- /dev/null
+++ b/tools/cooja/apps/mspsim/.cvsignore
@@ -0,0 +1 @@
+build