diff --git a/src/mcx_utils.c b/src/mcx_utils.c
index 5ff29d00..8277f580 100644
--- a/src/mcx_utils.c
+++ b/src/mcx_utils.c
@@ -3522,6 +3522,7 @@ void mcx_loadvolume(char* filename, Config* cfg, int isbuf) {
         for (i = 0; i < datalen; i++) {
             f2h[0] = val[i << (1 + offset)] * cfg->unitinmm;       // mua
             f2h[1] = val[(i << (1 + offset)) + 1] * cfg->unitinmm; // mus
+            cfg->vol[i] = mcx_float2half2(f2h);
 
             if (f2h[0] != f2h[0] || f2h[1] != f2h[1]) { /*if one of mua/mus is nan in continuous medium, convert to 0-voxel*/
                 cfg->vol[i] = 0;
@@ -3532,12 +3533,9 @@ void mcx_loadvolume(char* filename, Config* cfg, int isbuf) {
             }
 
             if (cfg->mediabyte == MEDIA_ASGN_F2H) {
-                cfg->vol[i] = mcx_float2half2(f2h);
                 f2h[0] = val[(i << 2) + 2];   // g
                 f2h[1] = val[(i << 2) + 3];   // n
                 cfg->vol[i + datalen] = mcx_float2half2(f2h);
-            } else {
-                cfg->vol[i] = mcx_float2half2(f2h);
             }
         }
     } else if (cfg->mediabyte == MEDIA_2LABEL_SPLIT) {