diff --git a/internal/encoder/compiler_norace.go b/internal/encoder/compiler_norace.go
index 2576419..706c3db 100644
--- a/internal/encoder/compiler_norace.go
+++ b/internal/encoder/compiler_norace.go
@@ -4,7 +4,7 @@
 package encoder
 
 func CompileToGetCodeSet(ctx *RuntimeContext, typeptr uintptr) (*OpcodeSet, error) {
-	if typeptr > typeAddr.MaxTypeAddr {
+	if typeptr > typeAddr.MaxTypeAddr || typeptr < typeAddr.BaseTypeAddr {
 		return compileToGetCodeSetSlowPath(typeptr)
 	}
 	index := (typeptr - typeAddr.BaseTypeAddr) >> typeAddr.AddrShift
diff --git a/internal/encoder/compiler_race.go b/internal/encoder/compiler_race.go
index c744511..2589ef1 100644
--- a/internal/encoder/compiler_race.go
+++ b/internal/encoder/compiler_race.go
@@ -10,7 +10,7 @@ import (
 var setsMu sync.RWMutex
 
 func CompileToGetCodeSet(ctx *RuntimeContext, typeptr uintptr) (*OpcodeSet, error) {
-	if typeptr > typeAddr.MaxTypeAddr {
+	if typeptr > typeAddr.MaxTypeAddr || typeptr < typeAddr.BaseTypeAddr {
 		return compileToGetCodeSetSlowPath(typeptr)
 	}
 	index := (typeptr - typeAddr.BaseTypeAddr) >> typeAddr.AddrShift