diff --git a/install-php-extension.sh b/install-php-extension.sh
index bc0d44c..79a726f 100755
--- a/install-php-extension.sh
+++ b/install-php-extension.sh
@@ -3,7 +3,6 @@
 
 name=$1
 pecl install $name
-echo "extension=\"$name.so\"" >> `php --ini | grep "Loaded Configuration" | sed -e "s|.*:\s*||"`
-
+[ -z "`grep $name.so $phpConfigFile`" ] && echo "extension=\"$name.so\"" >> $phpConfigFile