diff --git a/sal/cpprt/operators_new_delete.cxx b/sal/cpprt/operators_new_delete.cxx
index 2b53ffac6119..71abf0071932 100644
--- a/sal/cpprt/operators_new_delete.cxx
+++ b/sal/cpprt/operators_new_delete.cxx
@@ -17,12 +17,6 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-
-#ifdef _MSC_VER /* avoid 'std::bad_alloc' unresolved externals */
-#define _CRTIMP
-#define _NTSDK
-#endif
-
 #include <algorithm>
 #include <new>
 #include <string.h>
diff --git a/shell/Executable_lngconvex.mk b/shell/Executable_lngconvex.mk
index 220f872596da..e3ca7e6a4566 100644
--- a/shell/Executable_lngconvex.mk
+++ b/shell/Executable_lngconvex.mk
@@ -9,10 +9,6 @@
 
 $(eval $(call gb_Executable_Executable,lngconvex))
 
-$(eval $(call gb_Executable_add_defs,lngconvex,\
-	-D_NTSDK \
-))
-
 $(eval $(call gb_Executable_use_external,lngconvex,boost_headers))
 
 $(eval $(call gb_Executable_use_sdk_api,lngconvex))
diff --git a/shell/Library_ooofilt.mk b/shell/Library_ooofilt.mk
index d225deb5dcbe..d8f68b05fe84 100644
--- a/shell/Library_ooofilt.mk
+++ b/shell/Library_ooofilt.mk
@@ -18,7 +18,6 @@ $(eval $(call gb_Library_add_defs,ooofilt,\
 	-DISOLATION_AWARE_ENABLED \
 	-DUNICODE \
 	-DWIN32_LEAN_AND_MEAN \
-	-D_NTSDK \
 	-D_UNICODE \
 ))
 $(eval $(call gb_Library_add_defs,ooofilt,\
diff --git a/shell/Library_ooofilt_x64.mk b/shell/Library_ooofilt_x64.mk
index cf12f73c03cf..c32a51261637 100644
--- a/shell/Library_ooofilt_x64.mk
+++ b/shell/Library_ooofilt_x64.mk
@@ -24,7 +24,6 @@ $(eval $(call gb_Library_add_defs,ooofilt_x64,\
 	-DISOLATION_AWARE_ENABLED \
 	-DUNICODE \
 	-DWIN32_LEAN_AND_MEAN \
-	-D_NTSDK \
 	-D_UNICODE \
 	-UNOMINMAX \
 ))
diff --git a/shell/Library_propertyhdl.mk b/shell/Library_propertyhdl.mk
index 36bc9f74a956..70b2763225fe 100644
--- a/shell/Library_propertyhdl.mk
+++ b/shell/Library_propertyhdl.mk
@@ -18,7 +18,6 @@ $(eval $(call gb_Library_add_defs,propertyhdl,\
 	-DISOLATION_AWARE_ENABLED \
 	-DUNICODE \
 	-DWIN32_LEAN_AND_MEAN \
-	-D_NTSDK \
 	-D_UNICODE \
 	-UNOMINMAX \
 ))
diff --git a/shell/Library_propertyhdl_x64.mk b/shell/Library_propertyhdl_x64.mk
index 72a9b5136b47..d73126a755ec 100644
--- a/shell/Library_propertyhdl_x64.mk
+++ b/shell/Library_propertyhdl_x64.mk
@@ -24,7 +24,6 @@ $(eval $(call gb_Library_add_defs,propertyhdl_x64,\
 	-DISOLATION_AWARE_ENABLED \
 	-DUNICODE \
 	-DWIN32_LEAN_AND_MEAN \
-	-D_NTSDK \
 	-D_UNICODE \
 	-UNOMINMAX \
 ))
diff --git a/shell/Library_shlxthdl.mk b/shell/Library_shlxthdl.mk
index a19de73b4f13..9cd0ceae50b3 100644
--- a/shell/Library_shlxthdl.mk
+++ b/shell/Library_shlxthdl.mk
@@ -18,7 +18,6 @@ $(eval $(call gb_Library_add_defs,shlxthdl,\
 	-DISOLATION_AWARE_ENABLED \
 	-DUNICODE \
 	-DWIN32_LEAN_AND_MEAN \
-	-D_NTSDK \
 	-D_UNICODE \
 	-UNOMINMAX \
 ))
diff --git a/shell/Library_shlxthdl_x64.mk b/shell/Library_shlxthdl_x64.mk
index 595263f06920..eef8081f48ed 100644
--- a/shell/Library_shlxthdl_x64.mk
+++ b/shell/Library_shlxthdl_x64.mk
@@ -24,7 +24,6 @@ $(eval $(call gb_Library_add_defs,shlxthdl_x64,\
 	-DISOLATION_AWARE_ENABLED \
 	-DUNICODE \
 	-DWIN32_LEAN_AND_MEAN \
-	-D_NTSDK \
 	-D_UNICODE \
 	-UNOMINMAX \
 ))
diff --git a/shell/StaticLibrary_shlxthandler_common.mk b/shell/StaticLibrary_shlxthandler_common.mk
index d2c9c8df5b22..1114b6a16fc0 100644
--- a/shell/StaticLibrary_shlxthandler_common.mk
+++ b/shell/StaticLibrary_shlxthandler_common.mk
@@ -18,7 +18,6 @@ $(eval $(call gb_StaticLibrary_add_defs,shlxthandler_common,\
 	-DISOLATION_AWARE_ENABLED \
 	-DUNICODE \
 	-DWIN32_LEAN_AND_MEAN \
-	-D_NTSDK \
 	-D_UNICODE \
 ))
 $(eval $(call gb_StaticLibrary_add_defs,shlxthandler_common,\
diff --git a/shell/StaticLibrary_shlxthandler_common_x64.mk b/shell/StaticLibrary_shlxthandler_common_x64.mk
index 17d601424310..106c9c572430 100644
--- a/shell/StaticLibrary_shlxthandler_common_x64.mk
+++ b/shell/StaticLibrary_shlxthandler_common_x64.mk
@@ -24,7 +24,6 @@ $(eval $(call gb_StaticLibrary_add_defs,shlxthandler_common_x64,\
 	-DISOLATION_AWARE_ENABLED \
 	-DUNICODE \
 	-DWIN32_LEAN_AND_MEAN \
-	-D_NTSDK \
 	-D_UNICODE \
 ))
 $(eval $(call gb_StaticLibrary_add_defs,shlxthandler_common_x64,\