diff --git a/src/clang_tu.cc b/src/clang_tu.cc
index 91fa2e38..5a87153a 100644
--- a/src/clang_tu.cc
+++ b/src/clang_tu.cc
@@ -45,7 +45,8 @@ static Pos Decomposed2LineAndCol(const SourceManager &SM,
                                  std::pair<FileID, unsigned> I) {
   int l = SM.getLineNumber(I.first, I.second) - 1,
       c = SM.getColumnNumber(I.first, I.second) - 1;
-  return {(int16_t)std::min(l, INT16_MAX), (int16_t)std::min(c, INT16_MAX)};
+  return {(int16_t)std::min<int>(l, INT16_MAX),
+          (int16_t)std::min<int>(c, INT16_MAX)};
 }
 
 Range FromCharSourceRange(const SourceManager &SM, const LangOptions &LangOpts,
diff --git a/src/lsp.cc b/src/lsp.cc
index 9adc2f42..3a95a9d8 100644
--- a/src/lsp.cc
+++ b/src/lsp.cc
@@ -18,6 +18,7 @@ limitations under the License.
 #include "log.hh"
 #include "serializers/json.hh"
 
+#include <algorithm>
 #include <stdio.h>
 
 namespace ccls {
diff --git a/src/position.cc b/src/position.cc
index 2a124c5b..b82d3097 100644
--- a/src/position.cc
+++ b/src/position.cc
@@ -17,6 +17,7 @@ limitations under the License.
 
 #include "serializer.hh"
 
+#include <algorithm>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -57,14 +58,10 @@ Range Range::FromString(const std::string &encoded) {
 bool Range::Contains(int line, int column) const {
   if (line > INT16_MAX)
     return false;
-  Pos p{int16_t(line), int16_t(std::min(column, INT16_MAX))};
+  Pos p{(int16_t)line, (int16_t)std::min<int>(column, INT16_MAX)};
   return !(p < start) && p < end;
 }
 
-Range Range::RemovePrefix(Pos position) const {
-  return {std::min(std::max(position, start), end), end};
-}
-
 std::string Range::ToString() {
   char buf[99];
   snprintf(buf, sizeof buf, "%d:%d-%d:%d", start.line + 1, start.column + 1,
diff --git a/src/position.hh b/src/position.hh
index 794c7af2..e595e1ed 100644
--- a/src/position.hh
+++ b/src/position.hh
@@ -52,7 +52,6 @@ struct Range {
 
   bool Valid() const { return start.Valid(); }
   bool Contains(int line, int column) const;
-  Range RemovePrefix(Pos position) const;
 
   std::string ToString();
 
@@ -76,12 +75,11 @@ void Reflect(Writer &visitor, Range &value);
 namespace std {
 template <> struct hash<ccls::Range> {
   std::size_t operator()(ccls::Range x) const {
-    union U {
-      ccls::Range range = {};
+    union {
+      ccls::Range range;
       uint64_t u64;
-    } u;
+    } u{x};
     static_assert(sizeof(ccls::Range) == 8);
-    u.range = x;
     return hash<uint64_t>()(u.u64);
   }
 };