diff --git a/plugins/node.d/snmp__df.in b/plugins/node.d/snmp__df.in
index 52d32e35a0..fc400a7093 100755
--- a/plugins/node.d/snmp__df.in
+++ b/plugins/node.d/snmp__df.in
@@ -145,7 +145,9 @@ foreach my $kept (@keep) # For each disk...
 
 my $stor_id;
 
-if (defined $partitions{""})
+my $foundpartitions = keys %partitions;
+
+if ($foundpartitions == 0 or defined $partitions{""})
 { # Oh bugger. Some (or all) mountpoints were undeterminable. The backup
   # solution is to just graph everything that claims to be a FixedDisk,
   # without checking if it's removable etc