diff --git a/Makefile b/Makefile
index 75958bc..cf0ac14 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ ESCAPE_SLASH=/
 DESTDIR=$(abspath build/install)
 BUILD_PREFIX=$(DESTDIR)$(shell cygpath.exe -u $(PREFIX))
 
-endif
+else
 
 PREFIX=/opt/wasi-sdk
 DESTDIR=$(abspath build/install)
@@ -33,6 +33,8 @@ BUILD_PREFIX=$(DESTDIR)$(PREFIX)
 ESCAPE_SLASH?=
 BASH=
 
+endif
+
 CLANG_VERSION=$(shell $(BASH) ./llvm_version.sh $(LLVM_PROJ_DIR))
 VERSION:=$(shell $(BASH) ./version.sh)
 DEBUG_PREFIX_MAP=-fdebug-prefix-map=$(ROOT_DIR)=wasisdk://v$(VERSION)