diff --git a/src/utils.cpp b/src/utils.cpp
index 6ac3131f29..7b09e1514b 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -1288,7 +1288,7 @@ int utils::date2num(const std::string &date)
 int utils::binary_search(const double needle, const int n, const double *haystack)
 {
   int lo = 0;
-  int hi = n-1;
+  int hi = n - 1;
 
   if (needle < haystack[lo]) return lo;
   if (needle >= haystack[hi]) return hi;
@@ -1296,11 +1296,13 @@ int utils::binary_search(const double needle, const int n, const double *haystac
   // insure haystack[lo] <= needle < haystack[hi] at every iteration
   // done when lo,hi are adjacent
 
-  int index = (lo+hi)/2;
-  while (lo < hi-1) {
-    if (needle < haystack[index]) hi = index;
-    else if (needle >= haystack[index]) lo = index;
-    index = (lo+hi)/2;
+  int index = (lo + hi) / 2;
+  while (lo < hi - 1) {
+    if (needle < haystack[index])
+      hi = index;
+    else if (needle >= haystack[index])
+      lo = index;
+    index = (lo + hi) / 2;
   }
 
   return index;