diff --git a/src/process/ProcessManagerImpl.cpp b/src/process/ProcessManagerImpl.cpp
index c5bde8164b..2f6543c580 100644
--- a/src/process/ProcessManagerImpl.cpp
+++ b/src/process/ProcessManagerImpl.cpp
@@ -26,6 +26,10 @@
 #include <regex>
 #include <string>
 
+#ifdef __APPLE__
+extern char **environ;
+#endif
+
 namespace stellar
 {