diff --git a/scintilla/boostregex/nppSpecifics.mak b/scintilla/boostregex/nppSpecifics.mak
index 3bdf6cea..55d7ace5 100644
--- a/scintilla/boostregex/nppSpecifics.mak
+++ b/scintilla/boostregex/nppSpecifics.mak
@@ -24,7 +24,7 @@ LOBJS=\
 
 INCLUDEDIRS=$(INCLUDEDIRS) -I$(BOOSTPATH)
 
-CXXFLAGS=$(CXXFLAGS) -DSCI_OWNREGEX
+CXXFLAGS=$(CXXFLAGS) -DSCI_OWNREGEX -arch:IA32
 !IFDEF DEBUG
 LDFLAGS=$(LDFLAGS) -LIBPATH:$(BOOSTLIBPATH)\debug\link-static\runtime-link-static\threading-multi
 !ELSE
diff --git a/scintilla/win32/scintilla.mak b/scintilla/win32/scintilla.mak
index add69269..dff2897e 100644
--- a/scintilla/win32/scintilla.mak
+++ b/scintilla/win32/scintilla.mak
@@ -21,7 +21,7 @@ CC=cl
 RC=rc
 LD=link
 
-CXXFLAGS=-Zi -TP -MP -W4 -EHsc -Zc:forScope -Zc:wchar_t -D_CRT_SECURE_NO_DEPRECATE=1
+CXXFLAGS=-Zi -TP -MP -W4 -EHsc -Zc:forScope -Zc:wchar_t -D_CRT_SECURE_NO_DEPRECATE=1 -arch:IA32
 CXXDEBUG=-Od -MTd -DDEBUG
 CXXNDEBUG=-O1 -MT -DNDEBUG -GL
 NAME=-Fo