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diff --git a/libcds/src/basics.h b/libcds/src/basics.h
index 6412228..39cb81b 100644
--- a/libcds/src/basics.h
+++ b/libcds/src/basics.h
@@ -47,13 +47,19 @@ using namespace std;
 
 
 /** number of bits in a uint */
+#ifndef W
 #define W 32
+#endif
 
 /** W-1 */
+#ifndef Wminusone
 #define Wminusone 31
+#endif
 
 /** 2W*/
+#ifndef WW
 #define WW 64
+#endif
 
 /** number of bits per uchar */
 #define bitsM 8