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diff --git a/libcds/src/basics.h b/libcds/src/basics.h
index 39cb81b..ba792b1 100644
--- a/libcds/src/basics.h
+++ b/libcds/src/basics.h
@@ -47,19 +47,16 @@ using namespace std;
 
 
 /** number of bits in a uint */
-#ifndef W
+#undef W
 #define W 32
-#endif
 
 /** W-1 */
-#ifndef Wminusone
+#undef Wminusone
 #define Wminusone 31
-#endif
 
 /** 2W*/
-#ifndef WW
+#undef WW
 #define WW 64
-#endif
 
 /** number of bits per uchar */
 #define bitsM 8