diff --git a/client/speed_stats.C b/client/speed_stats.C
index 1af5775532..63c9013dbe 100644
--- a/client/speed_stats.C
+++ b/client/speed_stats.C
@@ -80,8 +80,8 @@ int check_cache_size(int mem_size) {
         fprintf(stderr, "error: check_cache_size: negative mem_size\n");
         return ERR_NEG;
     }
-    logStride = (int)(log(STRIDE_MAX/STRIDE_MIN)/log(2.0))+1;
-    logCache = (int)(log(CACHE_MAX/CACHE_MIN)/log(2.0))+1;
+    logStride = (int)(log((double)(STRIDE_MAX/STRIDE_MIN))/log(2.0))+1;
+    logCache = (int)(log((double)(CACHE_MAX/CACHE_MIN))/log(2.0))+1;
     
     printf("Test will take about %.2f seconds.\n", SECS_PER_RUN*logStride*logCache);
     results = (double **)malloc(sizeof(double *)*logStride);