diff --git a/AWSCRTAndroidTestRunner/app/src/main/cpp/CMakeLists.txt b/AWSCRTAndroidTestRunner/app/src/main/cpp/CMakeLists.txt
index 63b82ecf9..9a91baba4 100644
--- a/AWSCRTAndroidTestRunner/app/src/main/cpp/CMakeLists.txt
+++ b/AWSCRTAndroidTestRunner/app/src/main/cpp/CMakeLists.txt
@@ -3,7 +3,7 @@
 
 # Sets the minimum version of CMake required to build the native library.
 
-cmake_minimum_required(VERSION 3.13)
+cmake_minimum_required(VERSION 3.9)
 
 # AWS lib
 set(path_to_common "${CMAKE_CURRENT_LIST_DIR}/../../../../..")
diff --git a/CMakeLists.txt b/CMakeLists.txt
index cbdca2e05..cb3f28504 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,6 +8,10 @@ project(aws-c-common LANGUAGES C VERSION 0.1.0)
 
 message(STATUS "CMake ${CMAKE_VERSION}")
 
+if (POLICY CMP0077)
+    cmake_policy(SET CMP0077 OLD) # Enable options to get their values from normal variables
+endif()
+
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 include(AwsCFlags)
 include(AwsCheckHeaders)
diff --git a/cmake/AwsTestHarness.cmake b/cmake/AwsTestHarness.cmake
index 69129a3d8..a63ad61a7 100644
--- a/cmake/AwsTestHarness.cmake
+++ b/cmake/AwsTestHarness.cmake
@@ -39,6 +39,16 @@ function(generate_test_driver driver_exe_name)
     add_executable(${driver_exe_name} ${CMAKE_CURRENT_BINARY_DIR}/test_runner.c ${TESTS})
     aws_set_common_properties(${driver_exe_name} NO_WEXTRA NO_PEDANTIC)
 
+    # Some versions of CMake (3.9-3.11) generate a test_runner.c file with
+    # a strncpy() call that triggers the "stringop-overflow" warning in GCC 8.1+
+    # This warning doesn't exist until GCC 7 though, so test for it before disabling.
+    if (NOT MSVC)
+        check_c_compiler_flag(-Wno-stringop-overflow HAS_WNO_STRINGOP_OVERFLOW)
+        if (HAS_WNO_STRINGOP_OVERFLOW)
+            SET_SOURCE_FILES_PROPERTIES(test_runner.c PROPERTIES COMPILE_FLAGS -Wno-stringop-overflow)
+        endif()
+    endif()
+
     aws_add_sanitizers(${driver_exe_name} ${${PROJECT_NAME}_SANITIZERS})
 
     target_link_libraries(${driver_exe_name} PRIVATE ${PROJECT_NAME})