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-rw-r--r--src/libstore/exec.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/exec.hh b/src/libstore/exec.hh
index fc5bd6ac8d0b..892815c5c1e6 100644
--- a/src/libstore/exec.hh
+++ b/src/libstore/exec.hh
@@ -15,7 +15,7 @@ typedef map<string, string> Environment;
 
 /* Run a program. */
 void runProgram(const string & program, 
-    const Strings & args, const Environment & env,
+    const Strings & args, Environment env,
     const string & logFileName);