diff --git a/templates/cpp.gtest/Makefile b/templates/cpp.gtest/Makefile
index c175b27..24d514d 100644
--- a/templates/cpp.gtest/Makefile
+++ b/templates/cpp.gtest/Makefile
@@ -21,7 +21,7 @@ USER_DIR = .
 CPPFLAGS += -I$(GTEST_DIR)/include
 
 # Flags passed to the C++ compiler.
-CXXFLAGS += -g -Wall -Wextra
+CXXFLAGS += -g -Wall -Wextra -pthread
 
 # All tests produced by this Makefile.  Remember to add new tests you
 # created to the list.