diff --git a/src/chm_lib.c b/src/chm_lib.c
index 6c6736c..d532691 100644
--- a/src/chm_lib.c
+++ b/src/chm_lib.c
@@ -175,8 +175,13 @@ typedef unsigned long           UInt64;
 
 #else
 
-/* yielding an error is preferable to yielding incorrect behavior */
-#error "Please define the sized types for your platform in chm_lib.c"
+typedef unsigned char           UChar;
+typedef int16_t                 Int16;
+typedef uint16_t                UInt16;
+typedef int32_t                 Int32;
+typedef uint32_t                UInt32;
+typedef int64_t                 Int64;
+typedef uint64_t                UInt64;
 #endif
 
 /* GCC */