diff --git a/src/libespeak-ng/compiledata.c b/src/libespeak-ng/compiledata.c
index 885ec325..46d5d612 100644
--- a/src/libespeak-ng/compiledata.c
+++ b/src/libespeak-ng/compiledata.c
@@ -138,7 +138,6 @@ static keywtab_t k_properties[] = {
 	{ "isVoiced",           0, i_isVoiced },   // voiced consonant, or vowel
 	{ "isFirstVowel",       0, i_isFirstVowel },
 	{ "isSecondVowel",      0, i_isSecondVowel },
-	{ "isSeqFlag1",         0, i_isSeqFlag1 },
 	{ "isTranslationGiven", 0, i_IsTranslationGiven },   // phoneme translation given in **_list or as [[...]]
 
 	{ NULL, 0, 0 }
diff --git a/src/libespeak-ng/synthdata.c b/src/libespeak-ng/synthdata.c
index 644745f9..0be5d854 100644
--- a/src/libespeak-ng/synthdata.c
+++ b/src/libespeak-ng/synthdata.c
@@ -1,7 +1,7 @@
 /*
  * Copyright (C) 2005 to 2014 by Jonathan Duddington
  * email: jonsd@users.sourceforge.net
- * Copyright (C) 2015-2016 Reece H. Dunn
+ * Copyright (C) 2015-2017 Reece H. Dunn
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -684,24 +684,6 @@ static bool InterpretCondition(Translator *tr, int control, PHONEME_LIST *plist,
 				return CountVowelPosition(plist) == 1;
 			case 14: // isSecondVowel
 				return CountVowelPosition(plist) == 2;
-			case 15: // isSeqFlag1
-				// is this preceded  by a sequence if 1 or more vowels which have 'flag1' ?  (lang=hi)
-				if (plist->sourceix != 0)
-					return false; // this is the first phoneme in the word, so no.
-
-				count = 0;
-				for (;;) {
-					plist--;
-					if (plist->ph->type == phVOWEL) {
-						if (plist->ph->phflags & phFLAG1)
-							count++;
-						else
-							break; // stop when we find a vowel without flag1
-					}
-					if (plist->sourceix != 0)
-						break;
-				}
-				return count > 0;
 			case 0x10: // isTranslationGiven
 				return (plist->synthflags & SFLAG_DICTIONARY) != 0;
 			}
diff --git a/src/libespeak-ng/synthesize.h b/src/libespeak-ng/synthesize.h
index 1882fe2f..b09815df 100644
--- a/src/libespeak-ng/synthesize.h
+++ b/src/libespeak-ng/synthesize.h
@@ -328,7 +328,6 @@ typedef struct {
 #define i_isVoiced     0x8c
 #define i_isFirstVowel 0x8d
 #define i_isSecondVowel 0x8e
-#define i_isSeqFlag1   0x8f
 #define i_IsTranslationGiven 0x90
 
 // place of articulation