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-rw-r--r--src/libstore/storeexpr.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/storeexpr.cc b/src/libstore/storeexpr.cc
index 45b5af055a9b..29f271de884b 100644
--- a/src/libstore/storeexpr.cc
+++ b/src/libstore/storeexpr.cc
@@ -17,7 +17,7 @@ Path writeTerm(ATerm t, const string & suffix)
     Path path = canonPath(nixStore + "/" + 
         (string) h + suffix + ".store");
 
-    if (!isValidPath(path)) {
+    if (!readOnlyMode && !isValidPath(path)) {
         char * s = ATwriteToString(t);
         if (!s) throw Error(format("cannot write aterm to `%1%'") % path);
         addTextToStore(path, string(s));