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-rw-r--r--src/libmain/shared.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index 9d506d019233..4747b9bf9b4c 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -159,7 +159,7 @@ struct LegacyArgs : public MixCommonArgs
             &(bool&) settings.keepGoing);
 
         mkFlag(0, "fallback", "build from source if substitution fails", []() {
-            settings.set("build-fallback", "true");
+            settings.tryFallback = true;
         });
 
         mkFlag1('j', "max-jobs", "jobs", "maximum number of parallel builds", [=](std::string s) {