diff --git a/src/wp-admin/includes/class-pclzip.php b/src/wp-admin/includes/class-pclzip.php
index f36a4a3eef..ae0af7a8f1 100644
--- a/src/wp-admin/includes/class-pclzip.php
+++ b/src/wp-admin/includes/class-pclzip.php
@@ -1839,18 +1839,19 @@
     // ----- Get 'memory_limit' configuration value
     $v_memory_limit = ini_get('memory_limit');
     $v_memory_limit = trim($v_memory_limit);
+    $v_memory_limit_int = (int) $v_memory_limit;
     $last = strtolower(substr($v_memory_limit, -1));
 
     if($last == 'g')
-        //$v_memory_limit = $v_memory_limit*1024*1024*1024;
-        $v_memory_limit = $v_memory_limit*1073741824;
+        //$v_memory_limit_int = $v_memory_limit_int*1024*1024*1024;
+        $v_memory_limit_int = $v_memory_limit_int*1073741824;
     if($last == 'm')
-        //$v_memory_limit = $v_memory_limit*1024*1024;
-        $v_memory_limit = $v_memory_limit*1048576;
+        //$v_memory_limit_int = $v_memory_limit_int*1024*1024;
+        $v_memory_limit_int = $v_memory_limit_int*1048576;
     if($last == 'k')
-        $v_memory_limit = $v_memory_limit*1024;
+        $v_memory_limit_int = $v_memory_limit_int*1024;
 
-    $p_options[PCLZIP_OPT_TEMP_FILE_THRESHOLD] = floor($v_memory_limit*PCLZIP_TEMPORARY_FILE_RATIO);
+    $p_options[PCLZIP_OPT_TEMP_FILE_THRESHOLD] = floor($v_memory_limit_int*PCLZIP_TEMPORARY_FILE_RATIO);
 
 
     // ----- Sanity check : No threshold if value lower than 1M