diff --git a/xwords4/android/XWords4/jni/Android.mk b/xwords4/android/XWords4/jni/Android.mk
index e09c94f3b..671e37409 100644
--- a/xwords4/android/XWords4/jni/Android.mk
+++ b/xwords4/android/XWords4/jni/Android.mk
@@ -32,6 +32,7 @@ local_DEFINES += \
 	-DFEATURE_TRAY_EDIT \
 	-DMAX_ROWS=32 \
 	-DHASH_STREAM \
+	-DXWFEATURE_BASE64 \
 	-DINITIAL_CLIENT_VERS=2 \
 	-DNODE_CAN_4 \
 	-DRELAY_ROOM_DEFAULT=\"\" \
diff --git a/xwords4/android/XWords4/jni/xwjni.c b/xwords4/android/XWords4/jni/xwjni.c
index 03c67b46a..aa968f0b7 100644
--- a/xwords4/android/XWords4/jni/xwjni.c
+++ b/xwords4/android/XWords4/jni/xwjni.c
@@ -1581,7 +1581,7 @@ Java_org_eehouse_android_xw4_jni_XwJNI_dict_1iter_1getStartsWith
     return result;
 }
 
-#ifdef XWFEATURE_SMS
+#ifdef XWFEATURE_BASE64
 JNIEXPORT jstring JNICALL
 Java_org_eehouse_android_xw4_jni_XwJNI_base64Encode
 ( JNIEnv* env, jclass C, jbyteArray jbytes )
diff --git a/xwords4/common/strutils.c b/xwords4/common/strutils.c
index cc1c762d9..303890303 100644
--- a/xwords4/common/strutils.c
+++ b/xwords4/common/strutils.c
@@ -255,7 +255,7 @@ randIntArray( XP_U16* rnums, XP_U16 count )
     return changed;
 } /* randIntArray */
 
-#ifdef XWFEATURE_SMS
+#ifdef XWFEATURE_BASE64
 /* base-64 encode binary data as a message legal for SMS.  See
  * http://www.ietf.org/rfc/rfc2045.txt for the algorithm.  glib uses this and
  * so it's not needed on linux, but unless all platforms provided identical
diff --git a/xwords4/common/strutils.h b/xwords4/common/strutils.h
index b02671541..b4a200fb7 100644
--- a/xwords4/common/strutils.h
+++ b/xwords4/common/strutils.h
@@ -88,7 +88,7 @@ XP_UCHAR* emptyStringIfNull( XP_UCHAR* str );
 /* Produce an array of ints 0..count-1, juggled */
 XP_Bool randIntArray( XP_U16* rnums, XP_U16 count );
 
-#ifdef XWFEATURE_SMS
+#ifdef XWFEATURE_BASE64
 void binToSms( XP_UCHAR* out, XP_U16* outlen, const XP_U8* in, XP_U16 inlen );
 XP_Bool smsToBin( XP_U8* out, XP_U16* outlen, const XP_UCHAR* in, XP_U16 inlen );
 #endif