diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 9b3f799b9..ec3684632 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -3091,7 +3091,7 @@ void DerivationGoal::handleChildOutput(int fd, const string & data)
     }
 
     if (hook && fd == hook->fromHook.readSide.get())
-        printError(data); // FIXME?
+        printError(chomp(data));
 }