diff --git a/src/plugins/projectexplorer/toolchainmanager.cpp b/src/plugins/projectexplorer/toolchainmanager.cpp
index 729e8f5c613..5a9eb58870f 100644
--- a/src/plugins/projectexplorer/toolchainmanager.cpp
+++ b/src/plugins/projectexplorer/toolchainmanager.cpp
@@ -328,7 +328,7 @@ bool ToolChainManager::registerToolChain(ToolChain *tc)
     if (!tc || d->toolChains().contains(tc))
         return true;
     foreach (ToolChain *current, d->toolChains()) {
-        if (*tc == *current)
+        if (*tc == *current && !tc->isAutoDetected())
             return false;
     }