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-rw-r--r--src/libstore/worker-protocol.hh3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libstore/worker-protocol.hh b/src/libstore/worker-protocol.hh
index e48fd5fe9708..0126c8d59db9 100644
--- a/src/libstore/worker-protocol.hh
+++ b/src/libstore/worker-protocol.hh
@@ -32,7 +32,8 @@ typedef enum {
 
 
 #define STDERR_NEXT  0x6f6c6d67
-#define STDERR_DATA  0x64617461
+#define STDERR_READ  0x64617461 // data needed from source
+#define STDERR_WRITE 0x64617416 // data for sink
 #define STDERR_LAST  0x616c7473
 #define STDERR_ERROR 0x63787470