diff --git a/lib/std/core/cinterop.c3 b/lib/std/core/cinterop.c3
index 13480a64b..5cb9e6ca9 100644
--- a/lib/std/core/cinterop.c3
+++ b/lib/std/core/cinterop.c3
@@ -29,7 +29,7 @@ def CUChar = char;
 
 def CChar = $typefrom($$C_CHAR_IS_SIGNED ? ichar.typeid : char.typeid);
 
-enum CBool : CInt
+enum CBool : char
 {
 	FALSE,
 	TRUE
diff --git a/releasenotes.md b/releasenotes.md
index b23b0b255..2ef396494 100644
--- a/releasenotes.md
+++ b/releasenotes.md
@@ -30,6 +30,7 @@
 - Use `weak` on dyn-symbols on Linux.
 - Fix crash on project.json not having an empty set of targets.
 - Miscompile when indexing an array with small unsigned types for enums.
+- Change CBool to be 1 byte.
 
 ### Stdlib changes
 - Increase BitWriter.write_bits limit up to 32 bits.