diff --git a/lsmod.c b/lsmod.c
index fd306bc..cf3e734 100644
--- a/lsmod.c
+++ b/lsmod.c
@@ -45,6 +45,8 @@ main(int argc, char *argv[])
 		printf("%-20s%8s%3s %s\n", name, size, refcount,
 		       users);
 	}
+	if (ferror(fp))
+		eprintf("%s: read error:", modfile);
 	fclose(fp);
 	return 0;
 }
diff --git a/lsusb.c b/lsusb.c
index dfe9863..e41f127 100644
--- a/lsusb.c
+++ b/lsusb.c
@@ -50,6 +50,8 @@ lsusb(const char *file)
 			break;
 		}
 	}
+	if (ferror(fp))
+		eprintf("%s: read error:", path);
 	fclose(fp);
 }