diff --git a/src/system/kernel/fs/fd.cpp b/src/system/kernel/fs/fd.cpp
index ac94ff77e3..a15b3b6e3b 100644
--- a/src/system/kernel/fs/fd.cpp
+++ b/src/system/kernel/fs/fd.cpp
@@ -748,7 +748,7 @@ common_user_io(int fd, off_t pos, void* buffer, size_t length, bool write)
 	}
 
 	bool movePosition = false;
-	if (pos == -1 && (!write || (descriptor->open_mode & O_APPEND) == 0)) {
+	if (pos == -1) {
 		pos = descriptor->pos;
 		movePosition = true;
 	}
@@ -768,10 +768,10 @@ common_user_io(int fd, off_t pos, void* buffer, size_t length, bool write)
 	if (status != B_OK)
 		return status;
 
-	if (movePosition)
-		descriptor->pos = pos + length;
-	else if (pos == -1)
-		descriptor->pos = descriptor->ops->fd_seek(descriptor, 0, SEEK_END);
+	if (movePosition) {
+		descriptor->pos = write && (descriptor->open_mode & O_APPEND) != 0
+			? descriptor->ops->fd_seek(descriptor, 0, SEEK_END) : pos + length;
+	}
 
 	return length <= SSIZE_MAX ? (ssize_t)length : SSIZE_MAX;
 }
@@ -810,7 +810,7 @@ common_user_vector_io(int fd, off_t pos, const iovec* userVecs, size_t count,
 		return B_BAD_ADDRESS;
 
 	bool movePosition = false;
-	if (pos == -1 && (!write || (descriptor->open_mode & O_APPEND) == 0)) {
+	if (pos == -1) {
 		pos = descriptor->pos;
 		movePosition = true;
 	}
@@ -854,17 +854,16 @@ common_user_vector_io(int fd, off_t pos, const iovec* userVecs, size_t count,
 		else
 			bytesTransferred += (ssize_t)length;
 
-		if (pos > -1)
-			pos += length;
+		pos += length;
 
 		if (length < vecs[i].iov_len)
 			break;
 	}
 
-	if (movePosition)
-		descriptor->pos = pos;
-	else if (pos == -1)
-		descriptor->pos = descriptor->ops->fd_seek(descriptor, 0, SEEK_END);
+	if (movePosition) {
+		descriptor->pos = write && (descriptor->open_mode & O_APPEND) != 0
+			? descriptor->ops->fd_seek(descriptor, 0, SEEK_END) : pos;
+	}
 
 	return bytesTransferred;
 }