diff --git a/ApplicationCode/FileInterface/FileInterface_UnitTests/CMakeLists.txt b/ApplicationCode/FileInterface/FileInterface_UnitTests/CMakeLists.txt
index 092d8d9098..722f928d99 100644
--- a/ApplicationCode/FileInterface/FileInterface_UnitTests/CMakeLists.txt
+++ b/ApplicationCode/FileInterface/FileInterface_UnitTests/CMakeLists.txt
@@ -75,6 +75,10 @@ set( LINK_LIBRARIES
     ${QT_LIBRARIES}
 )
 
+if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+    set(CMAKE_CXX_FLAGS "-DGTEST_USE_OWN_TR1_TUPLE=1")
+endif()
+
 add_executable( ${ProjectName}
     ${CODE_HEADER_FILES}
 
diff --git a/ApplicationCode/ModelVisualization/ModelVisualization_UnitTests/CMakeLists.txt b/ApplicationCode/ModelVisualization/ModelVisualization_UnitTests/CMakeLists.txt
index 97e839bfc1..3f8c05e07e 100644
--- a/ApplicationCode/ModelVisualization/ModelVisualization_UnitTests/CMakeLists.txt
+++ b/ApplicationCode/ModelVisualization/ModelVisualization_UnitTests/CMakeLists.txt
@@ -61,6 +61,10 @@ IF(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
     set( EXTERNAL_LINK_LIBRARIES
         pthread
     )
+ELSEIF(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+    set( CMAKE_CXX_FLAGS
+        "-DGTEST_USE_OWN_TR1_TUPLE=1"
+    )
 ENDIF()
 
 target_link_libraries( ${ProjectName} ${LINK_LIBRARIES} ${EXTERNAL_LINK_LIBRARIES})
diff --git a/ApplicationCode/ReservoirDataModel/ReservoirDataModel_UnitTests/CMakeLists.txt b/ApplicationCode/ReservoirDataModel/ReservoirDataModel_UnitTests/CMakeLists.txt
index 6152868dbe..e46aef6985 100644
--- a/ApplicationCode/ReservoirDataModel/ReservoirDataModel_UnitTests/CMakeLists.txt
+++ b/ApplicationCode/ReservoirDataModel/ReservoirDataModel_UnitTests/CMakeLists.txt
@@ -87,6 +87,8 @@ IF(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
         set(CMAKE_CXX_FLAGS_RELEASE "-O2 -DNO_DEBUG")
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ")
 
+ELSEIF(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+        set(CMAKE_CXX_FLAGS         "-DGTEST_USE_OWN_TR1_TUPLE=1")
 ENDIF(${CMAKE_SYSTEM_NAME} MATCHES "Linux")