diff --git a/install_minimal/include/AirtimeInstall.php b/install_minimal/include/AirtimeInstall.php
index caf538409..0e0a05b4c 100644
--- a/install_minimal/include/AirtimeInstall.php
+++ b/install_minimal/include/AirtimeInstall.php
@@ -529,4 +529,14 @@ class AirtimeInstall
         }
         return $opts;
     }
+
+    public static function checkPHPVersion()
+    {
+        if (PHP_VERSION_ID < 50400)
+        {
+            echo "Error: Airtime requires PHP 5.4 or greater.";
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/install_minimal/include/airtime-install.php b/install_minimal/include/airtime-install.php
index ec7829269..a3b3090b6 100644
--- a/install_minimal/include/airtime-install.php
+++ b/install_minimal/include/airtime-install.php
@@ -12,6 +12,12 @@ require_once(__DIR__.'/airtime-constants.php');
 // The only way we get here is if we are doing a new install or a reinstall.
 // -------------------------------------------------------------------------
 
+//Enforce a minimum PHP version
+if (!AirtimeInstall::checkPHPVersion())
+{
+    exit(1);
+}
+
 $iniExists = file_exists("/etc/airtime/airtime.conf");
 if ($iniExists) {
     //reinstall, Will ask if we should rewrite config files.
diff --git a/install_minimal/include/airtime-upgrade.php b/install_minimal/include/airtime-upgrade.php
index a8e7a3a22..633312acd 100644
--- a/install_minimal/include/airtime-upgrade.php
+++ b/install_minimal/include/airtime-upgrade.php
@@ -34,6 +34,12 @@ $con = Propel::getConnection();
 
 $version = AirtimeInstall::GetVersionInstalled();
 
+//Enforce a minimum PHP version
+if (!AirtimeInstall::checkPHPVersion())
+{
+    exit(1);
+}
+
 echo "******************************** Upgrade Begin *********************************".PHP_EOL;
 
 $CC_CONFIG = Config::getConfig();