diff --git a/examples/PluckedStringsDemo/Source/StringSynthesiser.h b/examples/PluckedStringsDemo/Source/StringSynthesiser.h
index 385d595743..d1901385e8 100644
--- a/examples/PluckedStringsDemo/Source/StringSynthesiser.h
+++ b/examples/PluckedStringsDemo/Source/StringSynthesiser.h
@@ -81,7 +81,7 @@ private:
     //=======================================================================
     void prepareSynthesiserState (double sampleRate, double frequencyInHz)
     {
-        std::size_t delayLineLength =  std::lround (sampleRate / frequencyInHz);
+        size_t delayLineLength = (size_t) roundToInt (sampleRate / frequencyInHz);
 
         // we need a minimum delay line length to get a reasonable synthesis.
         // if you hit this assert, increase sample rate or decrease frequency!
diff --git a/modules/juce_audio_processors/format_types/juce_VST3PluginFormat.cpp b/modules/juce_audio_processors/format_types/juce_VST3PluginFormat.cpp
index b22fab42d5..1bef497845 100644
--- a/modules/juce_audio_processors/format_types/juce_VST3PluginFormat.cpp
+++ b/modules/juce_audio_processors/format_types/juce_VST3PluginFormat.cpp
@@ -2163,7 +2163,7 @@ private:
 
             if (object->getState (&stream) == kResultTrue)
             {
-                MemoryBlock info (stream.getData(), (std::size_t) stream.getSize());
+                MemoryBlock info (stream.getData(), (size_t) stream.getSize());
                 head.createNewChildElement (identifier)->addTextElement (info.toBase64Encoding());
             }
         }
diff --git a/modules/juce_core/text/juce_String.cpp b/modules/juce_core/text/juce_String.cpp
index 1b9fe6bbed..3dbc0c08e6 100644
--- a/modules/juce_core/text/juce_String.cpp
+++ b/modules/juce_core/text/juce_String.cpp
@@ -566,9 +566,9 @@ struct HashGenerator
     enum { multiplier = sizeof (Type) > 4 ? 101 : 31 };
 };
 
-int String::hashCode() const noexcept       { return HashGenerator<int>        ::calculate (text); }
-int64 String::hashCode64() const noexcept   { return HashGenerator<int64>      ::calculate (text); }
-std::size_t String::hash() const noexcept   { return HashGenerator<std::size_t>::calculate (text); }
+int String::hashCode() const noexcept       { return HashGenerator<int>    ::calculate (text); }
+int64 String::hashCode64() const noexcept   { return HashGenerator<int64>  ::calculate (text); }
+size_t String::hash() const noexcept        { return HashGenerator<size_t> ::calculate (text); }
 
 //==============================================================================
 JUCE_API bool JUCE_CALLTYPE operator== (const String& s1, const String& s2) noexcept            { return s1.compare (s2) == 0; }
diff --git a/modules/juce_core/text/juce_String.h b/modules/juce_core/text/juce_String.h
index 6a511070bb..0260acff13 100644
--- a/modules/juce_core/text/juce_String.h
+++ b/modules/juce_core/text/juce_String.h
@@ -181,7 +181,7 @@ public:
     int64 hashCode64() const noexcept;
 
     /** Generates a probably-unique hashcode from this string. */
-    std::size_t hash() const noexcept;
+    size_t hash() const noexcept;
 
     /** Returns the number of characters in the string. */
     int length() const noexcept;