diff --git a/htslib/ksort.h b/htslib/ksort.h
index ad19fc47a..fe2933bd5 100644
--- a/htslib/ksort.h
+++ b/htslib/ksort.h
@@ -64,6 +64,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include "hts.h"
 
 #ifndef klib_unused
 #if (defined __clang__ && __clang_major__ >= 3) || (defined __GNUC__ && __GNUC__ >= 3)
@@ -81,6 +82,7 @@ extern "C" {
 // problems on Windows.  Don't include htslib/hts_os.h for this as it
 // may not get on with older attempts to fix this in code that includes
 // this file.
+HTSLIB_EXPORT
 extern double hts_drand48(void);
 
 typedef struct {
diff --git a/htslib_vars.mk b/htslib_vars.mk
index 1f4c0905a..2a7b29450 100644
--- a/htslib_vars.mk
+++ b/htslib_vars.mk
@@ -42,7 +42,7 @@ htslib_khash_str2int_h = $(HTSPREFIX)htslib/khash_str2int.h $(htslib_khash_h)
 htslib_klist_h = $(HTSPREFIX)htslib/klist.h
 htslib_kroundup_h = $(HTSPREFIX)htslib/kroundup.h
 htslib_kseq_h = $(HTSPREFIX)htslib/kseq.h
-htslib_ksort_h = $(HTSPREFIX)htslib/ksort.h
+htslib_ksort_h = $(HTSPREFIX)htslib/ksort.h $(htslib_hts_h)
 htslib_kstring_h = $(HTSPREFIX)htslib/kstring.h $(htslib_hts_defs_h) $(htslib_kroundup_h)
 htslib_regidx_h = $(HTSPREFIX)htslib/regidx.h $(htslib_hts_h)
 htslib_sam_h = $(HTSPREFIX)htslib/sam.h $(htslib_hts_h) $(htslib_hts_endian_h)