diff --git a/src/dos/dos_files.cpp b/src/dos/dos_files.cpp
index c1574f17..5726f4f5 100644
--- a/src/dos/dos_files.cpp
+++ b/src/dos/dos_files.cpp
@@ -1229,7 +1229,10 @@ bool DOS_FileExists(char const * const name) {
 bool DOS_GetAllocationInfo(Bit8u drive,Bit16u * _bytes_sector,Bit8u * _sectors_cluster,Bit16u * _total_clusters) {
 	if (!drive) drive =  DOS_GetDefaultDrive();
 	else drive--;
-	if (drive >= DOS_DRIVES || !Drives[drive]) return false;
+	if (drive >= DOS_DRIVES || !Drives[drive]) {
+		DOS_SetError(DOSERR_INVALID_DRIVE);
+		return false;
+	}
 	Bit16u _free_clusters;
 	Drives[drive]->AllocationInfo(_bytes_sector,_sectors_cluster,_total_clusters,&_free_clusters);
 	SegSet16(ds,RealSeg(dos.tables.mediaid));