diff --git a/CMakeLists.txt b/CMakeLists.txt
index 14b7c1eb5..0b1ba6eba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,6 +9,11 @@ if("${CMAKE_SOURCE_DIR}" MATCHES " ")
 	message(FATAL_ERROR "The server cannot build in the path (" ${CMAKE_SOURCE_DIR} ") because it contains a space. Please move the server to a path without spaces.")
 endif()
 
+# Only 64-bit builds are supported: sent and stored values assume 64-bit pointers and sizes
+if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
+	message(FATAL_ERROR "The server only builds for 64-bit targets (this configuration is ${CMAKE_SIZEOF_VOID_P}-byte pointers). Use a 64-bit compiler and generator, e.g. -A x64 with Visual Studio.")
+endif()
+
 include(CTest)
 
 set(CMAKE_C_STANDARD 99)
diff --git a/README.md b/README.md
index 23e982680..647bc9a24 100644
--- a/README.md
+++ b/README.md
@@ -326,6 +326,8 @@ CREATE DATABASE darkflame;
 ```
 
 ## Build the server
+The server only builds for 64-bit targets; CMake refuses to configure a 32-bit build.
+
 You can either run `build.sh` when in the root folder of the repository:
 
 ```bash
diff --git a/dCommon/dEnums/dCommonVars.h b/dCommon/dEnums/dCommonVars.h
index 271669e30..89946de39 100644
--- a/dCommon/dEnums/dCommonVars.h
+++ b/dCommon/dEnums/dCommonVars.h
@@ -14,6 +14,8 @@
 
 #pragma warning (disable:4251) //Disables SQL warnings
 
+static_assert(sizeof(void*) == 8, "The server only builds for 64-bit targets");
+
 // These are the same define, but they mean two different things in different contexts
 // so a different define to distinguish what calculation is happening will help clarity.
 #define FRAMES_TO_MS(x) (1000 / (x))