diff --git a/src/libecoprimer/pairs.c b/src/libecoprimer/pairs.c
index 88fc9f5..64d8905 100644
--- a/src/libecoprimer/pairs.c
+++ b/src/libecoprimer/pairs.c
@@ -320,15 +320,15 @@ static void buildPrimerPairsForOneSeq(uint32_t seqid,
 		    		   w1a = extractSite(seqdb[seqid]->SQ,bp1,options->primer_length,strand);
 		    		   //get word of second approximate repeat
 		    		   w2a = extractSite(seqdb[seqid]->SQ,bp2,options->primer_length,!strand);
-		    		   
+		    		   		    		  		    		   
 		    		   w1 = w1 & omask;   //keep only strict_three_prime bases on the right (3') end
 		    		   w2 = w2 & omask;   //keep only strict_three_prime bases on the right (3') end
 		    		   w1a = w1a & omask; //keep only strict_three_prime bases on the right (3') end
 		    		   w2a = w2a & omask; //keep only strict_three_prime bases on the right (3') end
-		    		   
+		    		
 		    		   //now check that both words and primers of amplifia have same bases on 3' end
-		    		   if (w1 ^ w1a != 0) continue; 
-		    		   else if (w2 ^ w2a != 0) continue;
+		    		   if ((w1 ^ w1a) != 0) continue; 
+		    		   if ((w2 ^ w2a) != 0) continue;
 		    	   }