diff --git a/BREAKING-CHANGES.txt b/BREAKING-CHANGES.txt
index 914ad59f90..80a5bc16e3 100644
--- a/BREAKING-CHANGES.txt
+++ b/BREAKING-CHANGES.txt
@@ -4,6 +4,27 @@ JUCE breaking changes
 Develop
 =======
 
+Change
+------
+The fields representing Mac OS X 10.4 to 10.6 inclusive have been removed from
+the `OperatingSystemType` enum.
+
+Possible Issues
+---------------
+Code that uses these fields will fail to build.
+
+Workaround
+----------
+Remove references to these fields from user code.
+
+Rationale
+---------
+JUCE is not supported on Mac OS X versions lower than 10.7, so it is a given
+that `getOperatingSystemType` will always return an OS version greater than or
+equal to 10.7. Code that changes behaviours depending on the OS version can
+assume that this version is at least 10.7.
+
+
 Change
 ------
 The JUCE_DISABLE_COREGRAPHICS_FONT_SMOOTHING flag in juce_graphics is no
diff --git a/modules/juce_core/native/juce_mac_SystemStats.mm b/modules/juce_core/native/juce_mac_SystemStats.mm
index d3552ddfdd..9665260ed1 100644
--- a/modules/juce_core/native/juce_mac_SystemStats.mm
+++ b/modules/juce_core/native/juce_mac_SystemStats.mm
@@ -143,7 +143,7 @@ SystemStats::OperatingSystemType SystemStats::getOperatingSystemType()
     if (major == 10)
     {
         jassert (minor > 2);
-        return (OperatingSystemType) (minor + MacOSX_10_4 - 4);
+        return (OperatingSystemType) (minor + MacOSX_10_7 - 7);
     }
 
     jassert (major == 11 && minor == 0);
@@ -205,10 +205,8 @@ bool SystemStats::isOperatingSystem64Bit()
 {
    #if JUCE_IOS
     return false;
-   #elif JUCE_64BIT
-    return true;
    #else
-    return getOperatingSystemType() >= MacOSX_10_6;
+    return true;
    #endif
 }
 
diff --git a/modules/juce_core/native/juce_win32_SystemStats.cpp b/modules/juce_core/native/juce_win32_SystemStats.cpp
index 83f5dc6210..bbb2424b2b 100644
--- a/modules/juce_core/native/juce_win32_SystemStats.cpp
+++ b/modules/juce_core/native/juce_win32_SystemStats.cpp
@@ -283,9 +283,6 @@ String SystemStats::getOperatingSystemName()
         case Android:           JUCE_FALLTHROUGH
         case iOS:               JUCE_FALLTHROUGH
 
-        case MacOSX_10_4:       JUCE_FALLTHROUGH
-        case MacOSX_10_5:       JUCE_FALLTHROUGH
-        case MacOSX_10_6:       JUCE_FALLTHROUGH
         case MacOSX_10_7:       JUCE_FALLTHROUGH
         case MacOSX_10_8:       JUCE_FALLTHROUGH
         case MacOSX_10_9:       JUCE_FALLTHROUGH
diff --git a/modules/juce_core/system/juce_SystemStats.h b/modules/juce_core/system/juce_SystemStats.h
index 9568a693c5..3260af8e2c 100644
--- a/modules/juce_core/system/juce_SystemStats.h
+++ b/modules/juce_core/system/juce_SystemStats.h
@@ -52,9 +52,6 @@ public:
         Android         = 0x0800,
         iOS             = 0x1000,
 
-        MacOSX_10_4     = MacOSX | 4,
-        MacOSX_10_5     = MacOSX | 5,
-        MacOSX_10_6     = MacOSX | 6,
         MacOSX_10_7     = MacOSX | 7,
         MacOSX_10_8     = MacOSX | 8,
         MacOSX_10_9     = MacOSX | 9,