diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
index 8666d917..75b9affe 100644
--- a/PVE/API2/Qemu.pm
+++ b/PVE/API2/Qemu.pm
@@ -2649,6 +2649,12 @@ __PACKAGE__->register_method({
 
 	    my $drive = PVE::QemuServer::parse_drive($disk, $conf->{$disk});
 
+	    my (undef, undef, undef, undef, undef, undef, $format) =
+		PVE::Storage::parse_volname($storecfg, $drive->{file});
+
+	    die "can't resize volume: $disk if snapshot exists\n" 
+		if %{$conf->{snapshots}} && $format eq 'qcow2';
+
 	    my $volid = $drive->{file};
 
 	    die "disk '$disk' has no associated volume\n" if !$volid;