diff --git a/src/modlunit/units.cpp b/src/modlunit/units.cpp
index 8e3da7955a..3c325c3f20 100644
--- a/src/modlunit/units.cpp
+++ b/src/modlunit/units.cpp
@@ -127,6 +127,7 @@ static std::string neuronhome() {
 #else
     char* buf = std::getenv("NEURONHOME");
     return (buf != nullptr) ? std::string(buf) : std::string();
+#endif
 }