diff --git a/src/ecoprimer.c b/src/ecoprimer.c
index 45d2227..998a248 100644
--- a/src/ecoprimer.c
+++ b/src/ecoprimer.c
@@ -566,12 +566,12 @@ int main(int argc, char **argv)
           sscanf(optarg,"%d",&(options.error_max));
           break;
 
-//
-//								/* ------------------------ */
-//		case '3':               /* three prime strict match */
-//                                /* ------------------------ */
-//			sscanf(optarg,"%d",&(options.strict_three_prime));
-//			break;
+
+								/* ------------------------ */
+		case '3':               /* three prime strict match */
+                                /* ------------------------ */
+			sscanf(optarg,"%d",&(options.strict_three_prime));
+			break;
 
                                 /* -------------------- */
         case 'q':               /* strict matching quorum           */
diff --git a/src/libecoprimer/aproxpattern.c b/src/libecoprimer/aproxpattern.c
index 0cf349e..620bc80 100644
--- a/src/libecoprimer/aproxpattern.c
+++ b/src/libecoprimer/aproxpattern.c
@@ -97,8 +97,8 @@ pprimercount_t lookforAproxPrimer(pecodnadb_t database, uint32_t seqdbsize,uint3
 
 	params.circular = options->circular;
 	params.maxerr   = options->error_max;
-//	params.omask    = (1 << options->strict_three_prime) -1;
-	params.omask    = 0;
+	params.omask    = (1 << options->strict_three_prime) -1;
+//	params.omask    = 0;
 	params.patlen   = options->primer_length;
 
 	positions.val=NULL;