diff --git a/lldb/source/API/CMakeLists.txt b/lldb/source/API/CMakeLists.txt
index b51a334f8b47..ebe13611ee60 100644
--- a/lldb/source/API/CMakeLists.txt
+++ b/lldb/source/API/CMakeLists.txt
@@ -18,6 +18,7 @@ add_lldb_library(lldbAPI
   SBDeclaration.cpp
   SBError.cpp
   SBEvent.cpp
+  SBExecutionContext.cpp
   SBExpressionOptions.cpp
   SBFileSpec.cpp
   SBFileSpecList.cpp