diff --git a/modules/juce_audio_basics/buffers/juce_FloatVectorOperations.cpp b/modules/juce_audio_basics/buffers/juce_FloatVectorOperations.cpp
index 52153207ad..9eb1b03ead 100644
--- a/modules/juce_audio_basics/buffers/juce_FloatVectorOperations.cpp
+++ b/modules/juce_audio_basics/buffers/juce_FloatVectorOperations.cpp
@@ -1567,7 +1567,7 @@ public:
             const int num = random.nextInt (range) + 1;
 
             HeapBlock<ValueType> buffer1 (num + 16), buffer2 (num + 16);
-            HeapBlock<int> buffer3 (num + 16);
+            HeapBlock<int> buffer3 (num + 16, true);
 
            #if JUCE_ARM
             ValueType* const data1 = buffer1;
diff --git a/modules/juce_audio_basics/midi/juce_MidiRPN.cpp b/modules/juce_audio_basics/midi/juce_MidiRPN.cpp
index d18eff7181..ae5fc500f2 100644
--- a/modules/juce_audio_basics/midi/juce_MidiRPN.cpp
+++ b/modules/juce_audio_basics/midi/juce_MidiRPN.cpp
@@ -55,11 +55,6 @@ void MidiRPNDetector::reset() noexcept
 }
 
 //==============================================================================
-MidiRPNDetector::ChannelState::ChannelState() noexcept
-    : parameterMSB (0xff), parameterLSB (0xff), valueMSB (0xff), valueLSB (0xff), isNRPN (false)
-{
-}
-
 bool MidiRPNDetector::ChannelState::handleController (int channel,
                                                       int controllerNumber,
                                                       int value,
diff --git a/modules/juce_audio_basics/midi/juce_MidiRPN.h b/modules/juce_audio_basics/midi/juce_MidiRPN.h
index 9a70c1ca5b..f1fb9ff01e 100644
--- a/modules/juce_audio_basics/midi/juce_MidiRPN.h
+++ b/modules/juce_audio_basics/midi/juce_MidiRPN.h
@@ -95,14 +95,13 @@ private:
     //==============================================================================
     struct ChannelState
     {
-        ChannelState() noexcept;
         bool handleController (int channel, int controllerNumber,
                                int value, MidiRPNMessage&) noexcept;
         void resetValue() noexcept;
         bool sendIfReady (int channel, MidiRPNMessage&) noexcept;
 
-        uint8 parameterMSB, parameterLSB, valueMSB, valueLSB;
-        bool isNRPN;
+        uint8 parameterMSB = 0xff, parameterLSB = 0xff, valueMSB = 0xff, valueLSB = 0xff;
+        bool isNRPN = false;
     };
 
     //==============================================================================
diff --git a/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp b/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp
index 175a96ee37..a4775f64de 100644
--- a/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp
+++ b/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp
@@ -42,7 +42,8 @@ namespace OggVorbisNamespace
                                       "-Wredundant-decls",
                                       "-Wmisleading-indentation",
                                       "-Wmissing-prototypes",
-                                      "-Wcast-align")
+                                      "-Wcast-align",
+                                      "-Wmaybe-uninitialized")
  JUCE_BEGIN_NO_SANITIZE ("undefined")
 
  #include "oggvorbis/vorbisenc.h"
diff --git a/modules/juce_audio_processors/format_types/juce_VST3Headers.h b/modules/juce_audio_processors/format_types/juce_VST3Headers.h
index b599f03e72..148e7bfd1a 100644
--- a/modules/juce_audio_processors/format_types/juce_VST3Headers.h
+++ b/modules/juce_audio_processors/format_types/juce_VST3Headers.h
@@ -59,7 +59,8 @@ JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wdeprecated-copy-dtor",
                                      "-Wmissing-prototypes",
                                      "-Wtype-limits",
                                      "-Wcpp",
-                                     "-W#warnings")
+                                     "-W#warnings",
+                                     "-Wmaybe-uninitialized")
 
 #undef DEVELOPMENT
 #define DEVELOPMENT 0  // This avoids a Clang warning in Steinberg code about unused values
diff --git a/modules/juce_box2d/juce_box2d.cpp b/modules/juce_box2d/juce_box2d.cpp
index 54a8af9855..69f3aec214 100644
--- a/modules/juce_box2d/juce_box2d.cpp
+++ b/modules/juce_box2d/juce_box2d.cpp
@@ -35,7 +35,8 @@ JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wconversion",
                                      "-Wswitch-enum",
                                      "-Wswitch-default",
                                      "-Wunused-but-set-variable",
-                                     "-Wzero-as-null-pointer-constant")
+                                     "-Wzero-as-null-pointer-constant",
+                                     "-Wmaybe-uninitialized")
 
 #include <cstdarg>
 
diff --git a/modules/juce_box2d/juce_box2d.h b/modules/juce_box2d/juce_box2d.h
index c698be764d..ce66ea6ef0 100644
--- a/modules/juce_box2d/juce_box2d.h
+++ b/modules/juce_box2d/juce_box2d.h
@@ -52,7 +52,8 @@ JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wconversion",
                                      "-Wshadow-field",
                                      "-Wzero-as-null-pointer-constant",
                                      "-Wsign-conversion",
-                                     "-Wdeprecated")
+                                     "-Wdeprecated",
+                                     "-Wmaybe-uninitialized")
 
 #include <climits>
 #include <cfloat>
diff --git a/modules/juce_gui_extra/code_editor/juce_CPlusPlusCodeTokeniserFunctions.h b/modules/juce_gui_extra/code_editor/juce_CPlusPlusCodeTokeniserFunctions.h
index 50aa57d50e..9e6461f756 100644
--- a/modules/juce_gui_extra/code_editor/juce_CPlusPlusCodeTokeniserFunctions.h
+++ b/modules/juce_gui_extra/code_editor/juce_CPlusPlusCodeTokeniserFunctions.h
@@ -104,7 +104,7 @@ struct CppTokeniserFunctions
     static int parseIdentifier (Iterator& source) noexcept
     {
         int tokenLength = 0;
-        String::CharPointerType::CharType possibleIdentifier[100];
+        String::CharPointerType::CharType possibleIdentifier[100] = {};
         String::CharPointerType possible (possibleIdentifier);
 
         while (isIdentifierBody (source.peekNextChar()))
diff --git a/modules/juce_gui_extra/code_editor/juce_LuaCodeTokeniser.cpp b/modules/juce_gui_extra/code_editor/juce_LuaCodeTokeniser.cpp
index 16461918ed..36cebfcd2a 100644
--- a/modules/juce_gui_extra/code_editor/juce_LuaCodeTokeniser.cpp
+++ b/modules/juce_gui_extra/code_editor/juce_LuaCodeTokeniser.cpp
@@ -71,7 +71,7 @@ struct LuaTokeniserFunctions
     static int parseIdentifier (Iterator& source) noexcept
     {
         int tokenLength = 0;
-        String::CharPointerType::CharType possibleIdentifier[100];
+        String::CharPointerType::CharType possibleIdentifier[100] = {};
         String::CharPointerType possible (possibleIdentifier);
 
         while (CppTokeniserFunctions::isIdentifierBody (source.peekNextChar()))