diff --git a/ext/pdo_dblib/config.m4 b/ext/pdo_dblib/config.m4
index 55205bba217..ff4e03be4bb 100644
--- a/ext/pdo_dblib/config.m4
+++ b/ext/pdo_dblib/config.m4
@@ -73,7 +73,7 @@ if test "$PHP_PDO_DBLIB" != "no"; then
   AC_DEFINE(HAVE_FREETDS,1,[ ])
   PHP_SUBST(PDO_DBLIB_SHARED_LIBADD)
 
-  ifdef([PHP_ADD_EXTENDION_DEP],
+  ifdef([PHP_ADD_EXTENSION_DEP],
   [
     PHP_ADD_EXTENSION_DEP(pdo_dblib, pdo)
   ])
diff --git a/ext/pdo_mysql/config.m4 b/ext/pdo_mysql/config.m4
index 70b216a2a18..287a770d81f 100755
--- a/ext/pdo_mysql/config.m4
+++ b/ext/pdo_mysql/config.m4
@@ -79,7 +79,7 @@ Note that the MySQL client library is not bundled anymore!])
   ])
 
   PHP_NEW_EXTENSION(pdo_mysql, pdo_mysql.c mysql_driver.c mysql_statement.c, $ext_shared,,-I$pdo_inc_path)
-  ifdef([PHP_ADD_EXTENDION_DEP],
+  ifdef([PHP_ADD_EXTENSION_DEP],
   [
   	PHP_ADD_EXTENSION_DEP(pdo_mysql, pdo)
   ])
diff --git a/ext/pdo_oci/config.m4 b/ext/pdo_oci/config.m4
index 0a0d2a9219a..507cfd03f46 100755
--- a/ext/pdo_oci/config.m4
+++ b/ext/pdo_oci/config.m4
@@ -199,7 +199,7 @@ You need to tell me where to find your oracle SDK, or set ORACLE_HOME.
   PHP_SUBST_OLD(PDO_OCI_DIR)
   PHP_SUBST_OLD(PDO_OCI_VERSION)
 
-  ifdef([PHP_ADD_EXTENDION_DEP],
+  ifdef([PHP_ADD_EXTENSION_DEP],
   [
     PHP_ADD_EXTENSION_DEP(pdo_oci, pdo)
   ])
diff --git a/ext/pdo_sqlite/config.m4 b/ext/pdo_sqlite/config.m4
index 548e9a5cfd6..198bd51e722 100644
--- a/ext/pdo_sqlite/config.m4
+++ b/ext/pdo_sqlite/config.m4
@@ -113,7 +113,7 @@ EOF
       AC_CHECK_HEADERS(time.h)
     
   fi
-  ifdef([PHP_ADD_EXTENDION_DEP],
+  ifdef([PHP_ADD_EXTENSION_DEP],
   [
     PHP_ADD_EXTENSION_DEP(pdo_sqlite, pdo)
   ])