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-rw-r--r--src/stdio/open_memstream.c2
-rw-r--r--src/stdio/open_wmemstream.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/src/stdio/open_memstream.c b/src/stdio/open_memstream.c
index 2f3569f1..57737098 100644
--- a/src/stdio/open_memstream.c
+++ b/src/stdio/open_memstream.c
@@ -28,7 +28,7 @@ static off_t ms_seek(FILE *f, off_t off, int whence)
 		errno = EINVAL;
 		return -1;
 	}
-	if (-off > base || off > SSIZE_MAX-base) goto fail;
+	if (off < -base || off > SSIZE_MAX-base) goto fail;
 	return c->pos = base+off;
 }
 
diff --git a/src/stdio/open_wmemstream.c b/src/stdio/open_wmemstream.c
index 3bc0f254..41b92d21 100644
--- a/src/stdio/open_wmemstream.c
+++ b/src/stdio/open_wmemstream.c
@@ -29,7 +29,7 @@ static off_t wms_seek(FILE *f, off_t off, int whence)
 		errno = EINVAL;
 		return -1;
 	}
-	if (-off > base || off > SSIZE_MAX/4-base) goto fail;
+	if (off < -base || off > SSIZE_MAX/4-base) goto fail;
 	memset(&c->mbs, 0, sizeof c->mbs);
 	return c->pos = base+off;
 }