diff --git a/llvm/tools/llvm-exegesis/lib/PerfHelper.h b/llvm/tools/llvm-exegesis/lib/PerfHelper.h
index 0796c264b6229..a50974f0a67be 100644
--- a/llvm/tools/llvm-exegesis/lib/PerfHelper.h
+++ b/llvm/tools/llvm-exegesis/lib/PerfHelper.h
@@ -27,7 +27,7 @@
 typedef int pid_t;
 #else
 #include <sys/types.h>
-#endif // HAVE_LIBPFM
+#endif // _MSC_VER
 
 struct perf_event_attr;
 
diff --git a/llvm/tools/llvm-exegesis/lib/SubprocessMemory.h b/llvm/tools/llvm-exegesis/lib/SubprocessMemory.h
index 9b55bc40272b3..e20b50cdc8118 100644
--- a/llvm/tools/llvm-exegesis/lib/SubprocessMemory.h
+++ b/llvm/tools/llvm-exegesis/lib/SubprocessMemory.h
@@ -20,9 +20,12 @@
 #include <unordered_map>
 #include <vector>
 
-#ifndef __linux__
+#ifdef _MSC_VER
 typedef int pid_t;
-#endif // __linux__
+#else
+#include <sys/types.h>
+#endif // _MSC_VER
+
 
 namespace llvm {
 namespace exegesis {