diff --git a/win32.mak b/win32.mak
index 6c4e92ebe..54e72ec7a 100644
--- a/win32.mak
+++ b/win32.mak
@@ -291,7 +291,7 @@ SRC_STD_INTERNAL_WINDOWS= \
 	std\internal\windows\advapi32.d
 
 SRC_STD_EXP= \
-	std\experimental\typecons.d
+	std\experimental\checkedint.d std\experimental\typecons.d
 
 SRC_STD_EXP_ALLOC_BB= \
 	std\experimental\allocator\building_blocks\affix_allocator.d \
diff --git a/win64.mak b/win64.mak
index df4e1abbe..0d7b7c2a1 100644
--- a/win64.mak
+++ b/win64.mak
@@ -310,7 +310,7 @@ SRC_STD_INTERNAL_WINDOWS= \
 	std\internal\windows\advapi32.d
 
 SRC_STD_EXP= \
-	std\experimental\typecons.d
+	std\experimental\checkedint.d std\experimental\typecons.d
 
 SRC_STD_EXP_ALLOC_BB= \
 	std\experimental\allocator\building_blocks\affix_allocator.d \