diff --git a/src/app/eiffel/eiffel.go b/src/app/eiffel/eiffel.go
index 087574c0f5fdd0d8b5f748b23dd9c4c4bbcdd882..1eb8dd0a775d0a7764ab76fbb749e8192b9410b2 100644
--- a/src/app/eiffel/eiffel.go
+++ b/src/app/eiffel/eiffel.go
@@ -3,7 +3,7 @@ package eiffel
 
 // Cfg is EIFFEL's configuration struct. This can be used to unmarshal a TOML configuration file into.
 type Cfg struct {
-	NeglectOptional bool `toml:"neglect_optional"`
+	NeglectOptional bool `toml:"neglect_optional" env:"EIFFEL_NEGLECT_OPTIONAL"`
 }
 
 // TODO add tests for service, web and output