diff --git a/include/asm-sparc/floppy.h b/include/asm-sparc/floppy.h
index 780ee7f..caf9261 100644
--- a/include/asm-sparc/floppy.h
+++ b/include/asm-sparc/floppy.h
@@ -227,7 +227,7 @@
 	doing_pdma = 0;
 	if (pdma_base) {
 		mmu_unlockarea(pdma_base, pdma_areasize);
-		pdma_base = 0;
+		pdma_base = NULL;
 	}
 }