diff --git a/src/lib/formats/flopimg.c b/src/lib/formats/flopimg.c
index 97c0b6bf704..2aeea869565 100644
--- a/src/lib/formats/flopimg.c
+++ b/src/lib/formats/flopimg.c
@@ -77,7 +77,7 @@ static floppy_image_legacy *floppy_init(void *fp, const struct io_procs *procs,
 {
 	floppy_image_legacy *floppy;
 
-	floppy = (floppy_image_legacy *)malloc(sizeof(floppy_image));
+	floppy = (floppy_image_legacy *)malloc(sizeof(floppy_image_legacy));
 	if (!floppy)
 		return NULL;