diff --git a/repos/mml/src/app/posix_playground/target.mk b/repos/mml/src/app/posix_playground/target.mk
index 9e589affe7..adcd1302c1 100644
--- a/repos/mml/src/app/posix_playground/target.mk
+++ b/repos/mml/src/app/posix_playground/target.mk
@@ -1,5 +1,5 @@
-TARGET = thread_test
-SRC_CC = thread_test.cc 
+TARGET = posix_playground
+SRC_CC = main.cc
 LIBS += base posix libm libc stdcxx 
 CXXFLAGS += -Wno-error