diff --git a/configure.ac b/configure.ac
index a827da0..e938431 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,6 @@
 # General init
+
+# /!\ Don't forget to update 'windows/Makefile' too /!\
 AC_INIT(libnfc, 1.3.9, info@libnfc.org)
 
 AC_CONFIG_MACRO_DIR([m4])
diff --git a/windows/Makefile b/windows/Makefile
index 5b7788c..f10274e 100644
--- a/windows/Makefile
+++ b/windows/Makefile
@@ -14,7 +14,7 @@ NFCOPTS=	/I..\include				\
 			/DDRIVER_ARYGON_ENABLED		\
 			/DDRIVER_PN532_UART_ENABLED
 
-NFCLIBOPTS=/Dnfc_EXPORTS /DPACKAGE_VERSION=\"1.3.4\"
+NFCLIBOPTS=/Dnfc_EXPORTS /DPACKAGE_VERSION=\"1.3.9\"
 
 CFLAGS=$(COMMONOPTS) /WX $(NFCOPTS)
 CXXFLAGS=$(COMMONOPTS) /EHa $(NFCOPTS)