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-rw-r--r--src/libexpr/eval.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 31aaad5485f0..9eb5fc758985 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -139,6 +139,7 @@ EvalState::EvalState()
     , sSystem(symbols.create("system"))
     , sOverrides(symbols.create("__overrides"))
     , sOutputName(symbols.create("outputName"))
+    , sIgnoreNulls(symbols.create("__ignoreNulls"))
     , baseEnv(allocEnv(128))
     , baseEnvDispl(0)
     , staticBaseEnv(false, 0)