diff --git a/op-finder/OperationFinder.cpp b/op-finder/OperationFinder.cpp
index 1c04481..128d4ea 100644
--- a/op-finder/OperationFinder.cpp
+++ b/op-finder/OperationFinder.cpp
@@ -31,11 +31,6 @@ StatementMatcher UnaryArithmeticMatcher =
 StatementMatcher CompoundMatcher =
     compoundStmt().bind("compound_stmt");
 
-bool isInMainFile(const MatchFinder::MatchResult &result, const SourceLocation &loc)
-{
-  return result.Context->getSourceManager().isWrittenInMainFile(loc);
-}
-
 template<typename TOp>
 StringRef getOpcode(const TOp *op)
 {
@@ -78,9 +73,6 @@ void OperationFinder::_processAssignment(const clang::ast_matchers::MatchFinder:
 
   assert(op);
 
-  if (!isInMainFile(result, op->getBeginLoc()))
-    return;
-
   const auto& loc = op->getBeginLoc();
   const auto& source_manager = *result.SourceManager;
 
@@ -101,9 +93,6 @@ void OperationFinder::_processArithmetic(const MatchFinder::MatchResult& result)
 
   assert(op);
 
-  if (!isInMainFile(result, op->getBeginLoc()))
-    return;
-
   const auto& loc = op->getBeginLoc();
   const auto& source_manager = *result.SourceManager;
 
@@ -128,9 +117,6 @@ void OperationFinder::_processCompoundStmt(const clang::ast_matchers::MatchFinde
   if (!op || !op->isCompoundAssignmentOp())
     return;
 
-  if (!isInMainFile(result, op->getBeginLoc()))
-    return;
-
   const auto& loc = op->getBeginLoc();
   const auto& source_manager = *result.SourceManager;
 
@@ -152,9 +138,6 @@ void OperationFinder::_processUnaryArithmetic(const MatchFinder::MatchResult &re
   assert(op);
   assert(lhs);
 
-  if (!isInMainFile(result, lhs->getBeginLoc()))
-    return;
-
   const auto& loc = lhs->getBeginLoc();
   const auto& source_manager = *result.SourceManager;