diff --git a/ncempy/io/dm.py b/ncempy/io/dm.py
index 32fbb97..2217968 100644
--- a/ncempy/io/dm.py
+++ b/ncempy/io/dm.py
@@ -961,6 +961,10 @@ def getDataset(self, index):
                 outputDict['pixelSize'] = self.scale[jj:jj + self.dataShape[ii]][::-1]
                 outputDict['pixelOrigin'] = self.origin[jj:jj + self.dataShape[ii]][::-1]
 
+        # Ensure the data is loaded into memory from the buffer
+        if self._on_memory:
+            outputDict['data'] = np.array(outputDict['data'])
+
         # Remove singular dimensions if present
         outputDict['data'] = np.squeeze(outputDict['data'])
         return outputDict