diff --git a/tests/Android.mk b/tests/Android.mk
index 6e61c7e..d582425 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -420,6 +420,8 @@
 LOCAL_CLANG := false
 LOCAL_MODULE := bionic-compile-time-tests-g++
 LOCAL_CPPFLAGS := -Wall
+# Disable color diagnostics so the warnings output matches the source
+LOCAL_CPPFLAGS +=  -fdiagnostics-color=never
 LOCAL_SRC_FILES := fortify_compilation_test.cpp
 include $(BUILD_STATIC_LIBRARY)
 
@@ -437,6 +439,8 @@
 LOCAL_CLANG := true
 LOCAL_MODULE := bionic-compile-time-tests-clang++
 LOCAL_CPPFLAGS := -Wall
+# Disable color diagnostics so the warnings output matches the source
+LOCAL_CPPFLAGS += -fno-color-diagnostics
 # FileCheck will error if there aren't any CLANG: lines in the file, but there
 # don't appear to be any cases where clang _does_ emit warnings for sn?printf :(
 LOCAL_SRC_FILES :=