diff --git a/src/os/solaris/sigar_os.h b/src/os/solaris/sigar_os.h
index 4977176d..e54c8ac1 100644
--- a/src/os/solaris/sigar_os.h
+++ b/src/os/solaris/sigar_os.h
@@ -253,9 +253,15 @@ struct sigar_t {
     solaris_mib2_t mib2;
 };
 
+#ifdef SIGAR_64BIT
+#define KSTAT_UINT ui64
+#else
+#define KSTAT_UINT ui32
+#endif
+
 #define kSTAT_uint(v, type) \
     ((sigar->koffsets.type[v] == -2) ? 0 : \
-    ((kstat_named_t *)ksp->ks_data + sigar->koffsets.type[v])->value.ui32)
+    ((kstat_named_t *)ksp->ks_data + sigar->koffsets.type[v])->value.KSTAT_UINT)
 
 #define kSYSTEM(v) kSTAT_uint(v, system)
 
diff --git a/src/os/solaris/solaris_sigar.c b/src/os/solaris/solaris_sigar.c
index af8c35f8..3e9761df 100644
--- a/src/os/solaris/solaris_sigar.c
+++ b/src/os/solaris/solaris_sigar.c
@@ -824,7 +824,7 @@ static int ucb_ps_args_get(sigar_t *sigar, sigar_pid_t pid,
     }
     else {
         snprintf(buffer, sizeof(buffer),
-                 "/usr/ucb/ps -ww %ld", pid);
+                 "/usr/ucb/ps -ww %ld", (long)pid);
 
         if (!(fp = popen(buffer, "r"))) {
             return errno;
@@ -1991,7 +1991,7 @@ static void ifstat_kstat_common(sigar_net_interface_stat_t *ifstat,
     int i;
 
     for (i=0; i<ndata; i++) {
-        sigar_uint64_t value = data[i].value.ui32;
+        sigar_uint64_t value = data[i].value.KSTAT_UINT;
 
         char *ptr = data[i].name;