diff --git a/src/Makevars.win b/src/Makevars.win
index 528a265..da8f47f 100644
--- a/src/Makevars.win
+++ b/src/Makevars.win
@@ -1,13 +1,13 @@
 PWD := $(shell pwd)
-export CONAN_HOME := "$(PWD)\conan-staging\.conan2"
-export CC := "$(shell "$(R_HOME)/bin/Rscript" -e 'Sys.which("gcc")')"
-export CXX := "$(shell "$(R_HOME)/bin/Rscript" -e 'Sys.which("g++")')"
+export CONAN_HOME := $(PWD)\conan-staging\.conan2
+CC := "$(shell "$(R_HOME)\bin\Rscript" -e 'Sys.which("gcc")')"
+CXX := "$(shell "$(R_HOME)\bin\Rscript" -e 'Sys.which("g++")')"
 
 CONANDEPS_MK := $(shell ..\run_conan.py)
 include $(CONANDEPS_MK)
 
 PKG_CPPFLAGS := -std=c++17
-PKG_CPPFLAGS := $(PKG_CPPFLAGS) $(shell "$(R_HOME)/bin/Rscript" -e 'Rcpp:::CxxFlags()' 2> /dev/null)
+PKG_CPPFLAGS := $(PKG_CPPFLAGS) $(shell "$(R_HOME)\bin\Rscript" -e 'Rcpp:::CxxFlags()' 2> /dev/null)
 PKG_CPPFLAGS := $(PKG_CPPFLAGS) $(addprefix -isystem ,$(CONAN_INCLUDE_DIRS))
 PKG_CPPFLAGS := $(PKG_CPPFLAGS) $(addprefix -isystem ,$(CONAN_INCLUDE_DIRS_HDF5_HDF5_C))
 PKG_CPPFLAGS := $(PKG_CPPFLAGS) $(addprefix -D ,$(CONAN_DEFINES))