diff --git a/install.sh b/install.sh
index a08f55c..b8b6302 100755
--- a/install.sh
+++ b/install.sh
@@ -48,22 +48,18 @@ chmod +x "$S"
 if [ ! -r "/bin/sns" ]; then
   sudo cp "$S" "/bin/sns"
 else
-    if [ -r "/bin/sns" ]; then
-        if grep "simple note system" "/bin/sns"; then
-            sudo rm /bin/sns
-            sudo cp "$S" "/bin/sns"
-        fi
+    if grep "simple note system" "/bin/sns"; then
+        sudo rm /bin/sns
+        sudo cp "$S" "/bin/sns"
     fi
 fi
 # Install Bash completion
 if [ ! -r "/usr/share/bash-completion/completions/sns" ]; then
    sudo cp "src/bash-completion/sns" "/usr/share/bash-completion/completions/sns"
 else
-    if [ -r "/usr/share/bash-completion/completions/sns" ]; then
-        if grep "simple note system" "/usr/share/bash-completion/completions/sns"; then
-            sudo rm /bin/sns
-            sudo cp "$S" "/bin/sns"
+    if grep "simple note system" "/usr/share/bash-completion/completions/sns"; then
+        sudo rm /bin/sns
+        sudo cp "$S" "/bin/sns"
         fi
-    fi
 fi
 exit