diff --git a/src/klib/ksort.h b/src/klib/ksort.h
index a0ea6256..d2fb3532 100644
--- a/src/klib/ksort.h
+++ b/src/klib/ksort.h
@@ -240,7 +240,7 @@ typedef struct {
     static void ks_shuffle_##name(size_t n, type_t a[])                        \
     {                                                                   \
         int i, j;                                                       \
-        for (i = n; i > 1; --i) {                                       \
+        for (i = (int)n; i > 1; --i) {                                  \
             type_t tmp;                                                 \
             j = (int)(drand48() * i);                                   \
             tmp = a[j]; a[j] = a[i-1]; a[i-1] = tmp;                    \
@@ -248,7 +248,7 @@ typedef struct {
     }                                                                   \
     static void ks_sample_##name(size_t n, size_t r, type_t a[]) /* FIXME: NOT TESTED!!! */ \
     { /* reference: http://code.activestate.com/recipes/272884/ */ \
-        int i, k, pop = n; \
+        int i, k, pop = (int)n; \
         for (i = (int)r, k = 0; i >= 0; --i) { \
             double z = 1., x = drand48(); \
             type_t tmp; \