diff --git a/mingw-w64-crt/lib-common/api-ms-win-core-heap-l1-1-0.def b/mingw-w64-crt/lib-common/api-ms-win-core-heap-l1-1-0.def
index 202bce3..36855dc 100644
--- a/mingw-w64-crt/lib-common/api-ms-win-core-heap-l1-1-0.def
+++ b/mingw-w64-crt/lib-common/api-ms-win-core-heap-l1-1-0.def
@@ -14,7 +14,6 @@
 HeapReAlloc
 HeapSetInformation
 HeapSize
-HeapSummary
 HeapUnlock
 HeapValidate
 HeapWalk
diff --git a/mingw-w64-crt/lib32/api-ms-win-core-heap-l1-1-0.def b/mingw-w64-crt/lib32/api-ms-win-core-heap-l1-1-0.def
index 419896a..bbb9ff8 100644
--- a/mingw-w64-crt/lib32/api-ms-win-core-heap-l1-1-0.def
+++ b/mingw-w64-crt/lib32/api-ms-win-core-heap-l1-1-0.def
@@ -14,7 +14,6 @@
 HeapReAlloc@16
 HeapSetInformation@16
 HeapSize@12
-HeapSummary@12
 HeapUnlock@4
 HeapValidate@12
 HeapWalk@8