diff --git a/build.win32x86/squeak.cog.spur.lowcode/Makefile b/build.win32x86/squeak.cog.spur.lowcode/Makefile
index 632c14bf57..091ebc98d5 100644
--- a/build.win32x86/squeak.cog.spur.lowcode/Makefile
+++ b/build.win32x86/squeak.cog.spur.lowcode/Makefile
@@ -7,5 +7,6 @@ VM:=Squeak
 VMSRCDIR:=../../spurlowcodesrc/vm
 
 COGDEFS:= -DSTACK_ALIGN_BYTES=16 -DALLOCA_LIES_SO_USE_GETSP=0
+COMPILER_TO_USE:=clang
 	
 include ../common/Makefile
diff --git a/build.win32x86/squeak.sista.spur/Makefile b/build.win32x86/squeak.sista.spur/Makefile
index e77a6092ca..d342d6ffb5 100644
--- a/build.win32x86/squeak.sista.spur/Makefile
+++ b/build.win32x86/squeak.sista.spur/Makefile
@@ -6,4 +6,6 @@
 VM:=Squeak
 VMSRCDIR:=../../spursistasrc/vm
 
+COMPILER_TO_USE:=clang
+
 include ../common/Makefile