diff --git a/trick_source/sim_services/MonteCarlo/Makefile b/trick_source/sim_services/MonteCarlo/Makefile
index a7b54f53..ce3988ae 100644
--- a/trick_source/sim_services/MonteCarlo/Makefile
+++ b/trick_source/sim_services/MonteCarlo/Makefile
@@ -4,6 +4,8 @@ include ${TRICK_HOME}/share/trick/makefiles/Makefile.tricklib
 
 -include Makefile_deps
 
+TRICK_CXXFLAGS += -std=c++11
+
 ifeq ($(HAVE_GSL),1)
 TRICK_CXXFLAGS += -D_HAVE_GSL
 ifneq ($(GSL_HOME),/usr)
diff --git a/trick_source/sim_services/MonteCarlo/test/Makefile b/trick_source/sim_services/MonteCarlo/test/Makefile
index 6585b30c..da7e0a1c 100644
--- a/trick_source/sim_services/MonteCarlo/test/Makefile
+++ b/trick_source/sim_services/MonteCarlo/test/Makefile
@@ -8,7 +8,7 @@
 include ${TRICK_HOME}/share/trick/makefiles/Makefile.common
 
 # Flags passed to the preprocessor.
-TRICK_CXXFLAGS += -I$(GTEST_HOME)/include -I$(TRICK_HOME)/include -g -Wall -Wextra -DGTEST_HAS_TR1_TUPLE=0
+TRICK_CXXFLAGS += -I$(GTEST_HOME)/include -I$(TRICK_HOME)/include -g -Wall -Wextra -DGTEST_HAS_TR1_TUPLE=0 -std=c++11
 TRICK_LIBS = -L${TRICK_LIB_DIR} -ltrick -ltrick_pyip -ltrick_comm -ltrick_math -ltrick_mm -ltrick_units
 TRICK_EXEC_LINK_LIBS += -L${GTEST_HOME}/lib64 -L${GTEST_HOME}/lib -lgtest -lgtest_main