diff --git a/bwamem.c b/bwamem.c
index 6fc2e5a..182b57a 100644
--- a/bwamem.c
+++ b/bwamem.c
@@ -543,8 +543,8 @@ void mem_chain2aln(const mem_opt_t *opt, int64_t l_pac, const uint8_t *pac, int
 				if (srt[i] == 0) continue;
 				t = &c->seeds[(uint32_t)srt[i]];
 				if (t->len < s->len * .95) continue; // only check overlapping if t is long enough; TODO: more efficient by early stopping
-				if (s->qbeg <= t->qbeg && s->qbeg + s->len >= t->qbeg && t->qbeg - s->qbeg != t->rbeg - s->rbeg) break;
-				if (t->qbeg <= s->qbeg && t->qbeg + t->len >= s->qbeg && s->qbeg - t->qbeg != s->rbeg - t->rbeg) break;
+				if (s->qbeg <= t->qbeg && s->qbeg + s->len - t->qbeg >= s->len>>2 && t->qbeg - s->qbeg != t->rbeg - s->rbeg) break;
+				if (t->qbeg <= s->qbeg && t->qbeg + t->len - s->qbeg >= s->len>>2 && s->qbeg - t->qbeg != s->rbeg - t->rbeg) break;
 			}
 			if (i == c->n) { // no overlapping seeds; then skip extension
 				srt[k] = 0; // mark that seed extension has not been performed
diff --git a/main.c b/main.c
index 8a0542c..8c1343c 100644
--- a/main.c
+++ b/main.c
@@ -3,7 +3,7 @@
 #include "utils.h"
 
 #ifndef PACKAGE_VERSION
-#define PACKAGE_VERSION "0.7.3-r375-beta"
+#define PACKAGE_VERSION "0.7.3-r376-beta"
 #endif
 
 int bwa_fa2pac(int argc, char *argv[]);