diff --git a/src/system/kernel/fs/fd.cpp b/src/system/kernel/fs/fd.cpp
index 53788598d1..af0adb3abd 100644
--- a/src/system/kernel/fs/fd.cpp
+++ b/src/system/kernel/fs/fd.cpp
@@ -819,7 +819,7 @@ common_user_vector_io(int fd, off_t pos, const iovec* userVecs, size_t count,
 		else
 			bytesTransferred += (ssize_t)length;
 
-		if (movePosition)
+		if (pos != -1)
 			pos += length;
 
 		if (length < vecs[i].iov_len)
@@ -1095,7 +1095,7 @@ _kern_readv(int fd, off_t pos, const iovec* vecs, size_t count)
 		else
 			bytesRead += (ssize_t)length;
 
-		if (movePosition)
+		if (pos != -1)
 			pos += vecs[i].iov_len;
 	}
 
@@ -1188,7 +1188,7 @@ _kern_writev(int fd, off_t pos, const iovec* vecs, size_t count)
 		else
 			bytesWritten += (ssize_t)length;
 
-		if (movePosition)
+		if (pos != -1)
 			pos += vecs[i].iov_len;
 	}