diff --git a/src/jsontestrunner/main.cpp b/src/jsontestrunner/main.cpp
index a1d911d..45db464 100644
--- a/src/jsontestrunner/main.cpp
+++ b/src/jsontestrunner/main.cpp
@@ -58,7 +58,7 @@ static JSONCPP_STRING readInputTestFile(const char* path) {
     return JSONCPP_STRING("");
   fseek(file, 0, SEEK_END);
   long const size = ftell(file);
-  unsigned long const usize = static_cast<unsigned long const>(size);
+  unsigned long const usize = static_cast<unsigned long>(size);
   fseek(file, 0, SEEK_SET);
   JSONCPP_STRING text;
   char* buffer = new char[size + 1];
diff --git a/src/lib_json/json_reader.cpp b/src/lib_json/json_reader.cpp
index 5d39921..4930c17 100644
--- a/src/lib_json/json_reader.cpp
+++ b/src/lib_json/json_reader.cpp
@@ -430,25 +430,25 @@ void Reader::readNumber() {
   char c = '0'; // stopgap for already consumed character
   // integral part
   while (c >= '0' && c <= '9')
-    c = (current_ = p) < end_ ? *p++ : 0;
+    c = (current_ = p) < end_ ? *p++ : '\0';
   // fractional part
   if (c == '.') {
-    c = (current_ = p) < end_ ? *p++ : 0;
+    c = (current_ = p) < end_ ? *p++ : '\0';
     while (c >= '0' && c <= '9')
-      c = (current_ = p) < end_ ? *p++ : 0;
+      c = (current_ = p) < end_ ? *p++ : '\0';
   }
   // exponential part
   if (c == 'e' || c == 'E') {
-    c = (current_ = p) < end_ ? *p++ : 0;
+    c = (current_ = p) < end_ ? *p++ : '\0';
     if (c == '+' || c == '-')
-      c = (current_ = p) < end_ ? *p++ : 0;
+      c = (current_ = p) < end_ ? *p++ : '\0';
     while (c >= '0' && c <= '9')
-      c = (current_ = p) < end_ ? *p++ : 0;
+      c = (current_ = p) < end_ ? *p++ : '\0';
   }
 }
 
 bool Reader::readString() {
-  Char c = 0;
+  Char c = '\0';
   while (current_ != end_) {
     c = getNextChar();
     if (c == '\\')
@@ -1394,20 +1394,20 @@ bool OurReader::readNumber(bool checkInf) {
   char c = '0'; // stopgap for already consumed character
   // integral part
   while (c >= '0' && c <= '9')
-    c = (current_ = p) < end_ ? *p++ : 0;
+    c = (current_ = p) < end_ ? *p++ : '\0';
   // fractional part
   if (c == '.') {
-    c = (current_ = p) < end_ ? *p++ : 0;
+    c = (current_ = p) < end_ ? *p++ : '\0';
     while (c >= '0' && c <= '9')
-      c = (current_ = p) < end_ ? *p++ : 0;
+      c = (current_ = p) < end_ ? *p++ : '\0';
   }
   // exponential part
   if (c == 'e' || c == 'E') {
-    c = (current_ = p) < end_ ? *p++ : 0;
+    c = (current_ = p) < end_ ? *p++ : '\0';
     if (c == '+' || c == '-')
-      c = (current_ = p) < end_ ? *p++ : 0;
+      c = (current_ = p) < end_ ? *p++ : '\0';
     while (c >= '0' && c <= '9')
-      c = (current_ = p) < end_ ? *p++ : 0;
+      c = (current_ = p) < end_ ? *p++ : '\0';
   }
   return true;
 }