diff --git a/src/Aircraft/continuous.cxx b/src/Aircraft/continuous.cxx
index 83e11e343..da338673c 100644
--- a/src/Aircraft/continuous.cxx
+++ b/src/Aircraft/continuous.cxx
@@ -44,7 +44,7 @@ static void writeRaw(std::ostream& out, const T& data)
 // Reads uncompressed vector<char> from file. Throws if length field is longer
 // than <max_length>.
 template<typename SizeType>
-static SizeType VectorRead(std::istream& in, std::vector<char>& out, uint32_t max_length=(1<<31))
+static SizeType VectorRead(std::istream& in, std::vector<char>& out, uint32_t max_length=(1u << 31))
 {
     SizeType    length;
     readRaw(in, length);
diff --git a/src/Input/jsinput.cxx b/src/Input/jsinput.cxx
index 0fbce4b16..561d1a4fa 100644
--- a/src/Input/jsinput.cxx
+++ b/src/Input/jsinput.cxx
@@ -115,7 +115,7 @@ int jsInput::getInput() {
     }
     if(button_bits != 0) {
         for(int i=0;i<=31;i++) {
-            if( ( button_bits & (1 << i) ) > 0 ) {
+            if( ( button_bits & (1u << i) ) > 0 ) {
                 button=i;
                 break;
             }