diff --git a/scrapy/tests/test_utils_memory.py b/scrapy/tests/test_utils_memory.py
index 0391c0cb9..028bff15f 100644
--- a/scrapy/tests/test_utils_memory.py
+++ b/scrapy/tests/test_utils_memory.py
@@ -11,9 +11,10 @@ class UtilsMemoryTestCase(unittest.TestCase):
             raise unittest.SkipTest('/proc filesystem not supported')
         vmsize = get_vmvalue_from_procfs('VmSize')
         vmrss = get_vmvalue_from_procfs('VmRSS')
-        assert vmsize > 0
-        assert vmrss > 0
-        assert vmsize > vmrss
+        self.assert_(isinstance(vmsize, int))
+        self.assert_(vmsize > 0)
+        self.assert_(vmrss > 0)
+        self.assert_(vmsize > vmrss)
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/scrapy/utils/memory.py b/scrapy/utils/memory.py
index 938e2d358..4e610c54e 100644
--- a/scrapy/utils/memory.py
+++ b/scrapy/utils/memory.py
@@ -21,5 +21,5 @@ def get_vmvalue_from_procfs(vmkey='VmSize', pid=None):
     if len(v) < 3:
         return 0  # invalid format?
     # convert Vm value to bytes
-    return float(v[1]) * _vmvalue_scale[v[2]]
+    return int(v[1]) * _vmvalue_scale[v[2]]