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-rw-r--r--src/libstore/build.cc5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index ca66be3b41f2..fecee04d54b1 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1914,8 +1914,9 @@ void DerivationGoal::initChild()
             Strings mounts = tokenizeString<Strings>(readFile("/proc/self/mountinfo", true), "\n");
             foreach (Strings::iterator, i, mounts) {
                 vector<string> fields = tokenizeString<vector<string> >(*i, " ");
-                if (mount(0, fields.at(4).c_str(), 0, MS_PRIVATE, 0) == -1)
-                    throw SysError(format("unable to make filesystem `%1%' private") % fields.at(4));
+                string fs = decodeOctalEscaped(fields.at(4));
+                if (mount(0, fs.c_str(), 0, MS_PRIVATE, 0) == -1)
+                    throw SysError(format("unable to make filesystem `%1%' private") % fs);
             }
 
             /* Bind-mount all the directories from the "host"