diff --git a/crypto/ec/ec_lcl.h b/crypto/ec/ec_lcl.h
index e6a491451fc232a8cf46737cc6cdb838b984f583..15caf4ed0f7335a3be6a34b29cffec36e5abfe9d 100644
--- a/crypto/ec/ec_lcl.h
+++ b/crypto/ec/ec_lcl.h
@@ -74,6 +74,8 @@
 #include <openssl/ec.h>
 #include <openssl/bn.h>
 
+#include "e_os.h"
+
 #if defined(__SUNPRO_C)
 # if __SUNPRO_C >= 0x520
 #  pragma error_messages (off,E_ARRAY_OF_INCOMPLETE_NONAME,E_ARRAY_OF_INCOMPLETE)