diff --git a/ChangeLog b/ChangeLog
index 95a6b793..63ce5abd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2010-08-19  Werner Koch  <wk@g10code.com>
+
+	* configure.ac (AH_BOTTOM): Define GPG_ERR_ENABLE_ERRNO_MACROS.
+
 2010-05-12  Marcus Brinkmann  <marcus@g10code.de>
 
 	* configure.ac: Check for setlocale.
diff --git a/configure.ac b/configure.ac
index cb22e523..8f4c77b4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -858,6 +858,9 @@ AH_BOTTOM([
 #else
 # define GPGME_GCC_A_PURE
 #endif
+
+/* Under WindowsCE we need gpg-error's strerror macro.  */
+#define GPG_ERR_ENABLE_ERRNO_MACROS 1
 ])