diff --git a/cc/config/x86_64_device.go b/cc/config/x86_64_device.go
index d9c96df..bcfae5d 100644
--- a/cc/config/x86_64_device.go
+++ b/cc/config/x86_64_device.go
@@ -63,7 +63,7 @@
 	}
 
 	x86_64ArchFeatureCflags = map[string][]string{
-		"ssse3":  []string{"-DUSE_SSSE3", "-mssse3"},
+		"ssse3":  []string{"-mssse3"},
 		"sse4":   []string{"-msse4"},
 		"sse4_1": []string{"-msse4.1"},
 		"sse4_2": []string{"-msse4.2"},
diff --git a/cc/config/x86_64_fuchsia_device.go b/cc/config/x86_64_fuchsia_device.go
index 79af00c..0f2013b 100644
--- a/cc/config/x86_64_fuchsia_device.go
+++ b/cc/config/x86_64_fuchsia_device.go
@@ -92,7 +92,7 @@
 }
 
 func (t *toolchainFuchsiaX8664) ToolchainClangCflags() string {
-	return "-DUSE_SSSE3 -mssse3"
+	return "-mssse3"
 }
 
 var toolchainFuchsiaSingleton Toolchain = &toolchainFuchsiaX8664{}
diff --git a/cc/config/x86_device.go b/cc/config/x86_device.go
index 6504758..64392dc 100644
--- a/cc/config/x86_device.go
+++ b/cc/config/x86_device.go
@@ -82,7 +82,7 @@
 	}
 
 	x86ArchFeatureCflags = map[string][]string{
-		"ssse3":  []string{"-DUSE_SSSE3", "-mssse3"},
+		"ssse3":  []string{"-mssse3"},
 		"sse4":   []string{"-msse4"},
 		"sse4_1": []string{"-msse4.1"},
 		"sse4_2": []string{"-msse4.2"},