diff --git a/ext/oci8/config.m4 b/ext/oci8/config.m4
index 8869d34c561..4eaf784faa8 100644
--- a/ext/oci8/config.m4
+++ b/ext/oci8/config.m4
@@ -50,7 +50,7 @@ AC_DEFUN([AC_OCI8_CHECK_LIB_DIR],[
 
 AC_DEFUN([AC_OCI8IC_VERSION],[
   AC_MSG_CHECKING([Oracle Instant Client version])
-  if test -f $PHP_OCI8_INSTANT_CLIENT/libociei.$SHLIB_SUFFIX_NAME; then
+  if test -f $PHP_OCI8_INSTANT_CLIENT/libnnz10.$SHLIB_SUFFIX_NAME; then
     if test -f $PHP_OCI8_INSTANT_CLIENT/libclntsh.$SHLIB_SUFFIX_NAME.10.1; then
       if test ! -f $PHP_OCI8_INSTANT_CLIENT/libclntsh.$SHLIB_SUFFIX_NAME; then
         AC_MSG_ERROR([Link from $PHP_OCI8_INSTANT_CLIENT/libclntsh.$SHLIB_SUFFIX_NAME to libclntsh.$SHLIB_SUFFIX_NAME.10.1 not found])