diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 8da1e9946fd7a1927a8ef2da038882706cbcf84c..fb3b51c4fcd100e01e57c7b669dd40b82a019bb9 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1273,7 +1273,6 @@ void DerivationGoal::computeClosure()
             if (!recursive) {
                 /* The output path should be a regular file without
                    execute permission. */
-                struct stat st;
                 if (!S_ISREG(st.st_mode) || (st.st_mode & S_IXUSR) != 0)
                     throw Error(
                         format("output path `%1% should be a non-executable regular file")