diff --git a/exposed/Makefile b/exposed/Makefile
index 67b1eec7..3b09e986 100644
--- a/exposed/Makefile
+++ b/exposed/Makefile
@@ -1,7 +1,7 @@
 DEFINES = /D_WIN32_WINNT=0x500 /DISOLATION_AWARE_ENABLED /D_WIN32_IE=0x500 /DWIN32_LEAN_AND_MEAN /DWIN32 /DLIBRARY
 # Use the multi-threaded static libc because libpng and zlib do; not sure if anything bad
 # happens if those mix, but don't want to risk it.
-CFLAGS  = /W3 /nologo -MT -Iextlib -I..\..\common\win32 /D_DEBUG /D_CRT_SECURE_NO_WARNINGS /I. /I.. /Zi /EHs /O2
+CFLAGS  = /W3 /nologo -MT -Iextlib -I..\..\common\win32 /D_DEBUG /D_CRT_SECURE_NO_WARNINGS /I. /I.. /Zi /EHs /O2 /GS-
 
 HEADERS = ..\solvespace.h ..\dsc.h ..\sketch.h ..\expr.h slvs.h