diff --git a/Makefile b/Makefile
index b89ff04..93b8d94 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,6 @@ SRC_FILES := \
 	$(SRC_DIR)/setup.zsh \
 	$(SRC_DIR)/config.zsh \
 	$(SRC_DIR)/util.zsh \
-	$(SRC_DIR)/features.zsh \
 	$(SRC_DIR)/bind.zsh \
 	$(SRC_DIR)/highlight.zsh \
 	$(SRC_DIR)/widgets.zsh \
diff --git a/src/features.zsh b/src/features.zsh
deleted file mode 100644
index 7a5248f..0000000
--- a/src/features.zsh
+++ /dev/null
@@ -1,19 +0,0 @@
-
-#--------------------------------------------------------------------#
-# Feature Detection                                                  #
-#--------------------------------------------------------------------#
-
-_zsh_autosuggest_feature_detect_zpty_returns_fd() {
-	typeset -g _ZSH_AUTOSUGGEST_ZPTY_RETURNS_FD
-	typeset -h REPLY
-
-	zpty zsh_autosuggest_feature_detect '{ zshexit() { kill -KILL $$; sleep 1 } }'
-
-	if (( REPLY )); then
-		_ZSH_AUTOSUGGEST_ZPTY_RETURNS_FD=1
-	else
-		_ZSH_AUTOSUGGEST_ZPTY_RETURNS_FD=0
-	fi
-
-	zpty -d zsh_autosuggest_feature_detect
-}
diff --git a/zsh-autosuggestions.zsh b/zsh-autosuggestions.zsh
index 4b617cc..83b2f7d 100644
--- a/zsh-autosuggestions.zsh
+++ b/zsh-autosuggestions.zsh
@@ -122,25 +122,6 @@ _zsh_autosuggest_escape_command() {
 	echo -E "${1//(#m)[\"\'\\()\[\]|*?~]/\\$MATCH}"
 }
 
-#--------------------------------------------------------------------#
-# Feature Detection                                                  #
-#--------------------------------------------------------------------#
-
-_zsh_autosuggest_feature_detect_zpty_returns_fd() {
-	typeset -g _ZSH_AUTOSUGGEST_ZPTY_RETURNS_FD
-	typeset -h REPLY
-
-	zpty zsh_autosuggest_feature_detect '{ zshexit() { kill -KILL $$; sleep 1 } }'
-
-	if (( REPLY )); then
-		_ZSH_AUTOSUGGEST_ZPTY_RETURNS_FD=1
-	else
-		_ZSH_AUTOSUGGEST_ZPTY_RETURNS_FD=0
-	fi
-
-	zpty -d zsh_autosuggest_feature_detect
-}
-
 #--------------------------------------------------------------------#
 # Widget Helpers                                                     #
 #--------------------------------------------------------------------#