diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e637c76b..0e71cb7e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        go: ['1.18', '1.19', '1.20']
+        go: ['1.19', '1.20']
     steps:
     - name: Set up Go
       uses: actions/setup-go@v2
diff --git a/history.go b/history.go
index e75c6459..9bf68d19 100644
--- a/history.go
+++ b/history.go
@@ -16,9 +16,7 @@ func (h *History) Add(input string) {
 // Clear to clear the history.
 func (h *History) Clear() {
 	h.tmp = make([]string, len(h.histories))
-	for i := range h.histories {
-		h.tmp[i] = h.histories[i]
-	}
+	copy(h.tmp, h.histories)
 	h.tmp = append(h.tmp, "")
 	h.selected = len(h.tmp) - 1
 }
diff --git a/input_posix.go b/input_posix.go
index cfa7cd26..1eae228e 100644
--- a/input_posix.go
+++ b/input_posix.go
@@ -14,8 +14,7 @@ const maxReadBytes = 1024
 
 // PosixParser is a ConsoleParser implementation for POSIX environment.
 type PosixParser struct {
-	fd          int
-	origTermios syscall.Termios
+	fd int
 }
 
 // Setup should be called before starting input