diff --git a/index.c b/index.c
index fd93dd3..b24a505 100644
--- a/index.c
+++ b/index.c
@@ -654,7 +654,7 @@ mm_idx_intv_t *mm_idx_read_bed(const mm_idx_t *mi, const char *fn, int read_junc
 		char *p, *q, *bl, *bs;
 		int32_t i, id = -1, n_blk = 0;
 		for (p = q = str.s, i = 0;; ++p) {
-			if (*p == 0 || isspace(*p)) {
+			if (*p == 0 || *p == '\t') {
 				int32_t c = *p;
 				*p = 0;
 				if (i == 0) { // chr
diff --git a/main.c b/main.c
index 9b41ff6..aee299a 100644
--- a/main.c
+++ b/main.c
@@ -7,7 +7,7 @@
 #include "mmpriv.h"
 #include "ketopt.h"
 
-#define MM_VERSION "2.17-r974-dirty"
+#define MM_VERSION "2.17-r1008-dirty"
 
 #ifdef __linux__
 #include <sys/resource.h>