diff --git a/reactos/dll/win32/user32/user32.rbuild b/reactos/dll/win32/user32/user32.rbuild
index 6a66156a7dd..c2e8315666d 100644
--- a/reactos/dll/win32/user32/user32.rbuild
+++ b/reactos/dll/win32/user32/user32.rbuild
@@ -12,7 +12,6 @@
 	<library>win32ksys</library>
 	<library>pseh</library>
 	<library>ntdll</library>
-	<compilerflag compilerset="gcc">-fms-extensions</compilerflag>
 	<directory name="include">
 		<pch>user32.h</pch>
 	</directory>
diff --git a/reactos/drivers/storage/class/ramdisk/ramdisk.rbuild b/reactos/drivers/storage/class/ramdisk/ramdisk.rbuild
index 7a326c6a798..f861502db18 100644
--- a/reactos/drivers/storage/class/ramdisk/ramdisk.rbuild
+++ b/reactos/drivers/storage/class/ramdisk/ramdisk.rbuild
@@ -6,5 +6,4 @@
 	<library>hal</library>
 	<file>ramdisk.c</file>
 	<file>ramdisk.rc</file>
-	<compilerflag compilerset="gcc">-fms-extensions</compilerflag>
 </module>
diff --git a/reactos/drivers/video/videoprt/videoprt.rbuild b/reactos/drivers/video/videoprt/videoprt.rbuild
index 992c20f3473..33e85561e6e 100644
--- a/reactos/drivers/video/videoprt/videoprt.rbuild
+++ b/reactos/drivers/video/videoprt/videoprt.rbuild
@@ -5,7 +5,6 @@
 	<include base="videoprt">.</include>
 	<include base="ntoskrnl">include</include>
 	<define name="_VIDEOPORT_" />
-	<compilerflag compilerset="gcc">-fms-extensions</compilerflag>
 	<library>ntoskrnl</library>
 	<library>hal</library>
 	<pch>videoprt.h</pch>
diff --git a/reactos/subsystems/win32/csrss/csrss.rbuild b/reactos/subsystems/win32/csrss/csrss.rbuild
index 438b2e6574a..43f87773d8d 100644
--- a/reactos/subsystems/win32/csrss/csrss.rbuild
+++ b/reactos/subsystems/win32/csrss/csrss.rbuild
@@ -6,7 +6,6 @@
 		<include base="csrss">include</include>
 		<include base="ReactOS">include/reactos/subsys</include>
 		<include base="ReactOS">include/reactos/drivers</include>
-		<compilerflag compilerset="gcc">-fms-extensions</compilerflag>
 		<library>nt</library>
 		<library>ntdll</library>
 		<library>csrsrv</library>
diff --git a/reactos/subsystems/win32/csrss/win32csr/win32csr.rbuild b/reactos/subsystems/win32/csrss/win32csr/win32csr.rbuild
index d81443be413..d402dbb8427 100644
--- a/reactos/subsystems/win32/csrss/win32csr/win32csr.rbuild
+++ b/reactos/subsystems/win32/csrss/win32csr/win32csr.rbuild
@@ -7,7 +7,6 @@
 	<include base="ReactOS">include/reactos/subsys</include>
 	<include base="ReactOS">include/reactos/drivers</include>
 	<include base="console">.</include>
-	<compilerflag compilerset="gcc">-fms-extensions</compilerflag>
 	<library>ntdll</library>
 	<library delayimport="true">user32</library>
 	<library delayimport="true">gdi32</library>
diff --git a/reactos/subsystems/win32/win32k/win32k.rbuild b/reactos/subsystems/win32/win32k/win32k.rbuild
index fa51a09635a..c9cf0ad78cd 100644
--- a/reactos/subsystems/win32/win32k/win32k.rbuild
+++ b/reactos/subsystems/win32/win32k/win32k.rbuild
@@ -16,7 +16,6 @@
 	<include base="freetype">include</include>
 	<include base="ReactOS">include/reactos/subsys</include>
 	<include base="ReactOS">include/reactos/drivers</include>
-	<compilerflag compilerset="gcc">-fms-extensions</compilerflag>
 	<compilerflag compilerset="msc">/wd4276</compilerflag>
 	<define name="LANGPACK" />
 	<define name="_WIN32K_" />