diff --git a/configs.h b/configs.h
index bf25596..7b420b5 100644
--- a/configs.h
+++ b/configs.h
@@ -23,11 +23,17 @@
 #define GEMMA_MAX_SEQLEN 4096
 #endif  // !GEMMA_MAX_SEQLEN
 
+// Allow changing k parameter of `SampleTopK` as a compiler flag
+#ifndef GEMMA_TOPK
+#define GEMMA_TOPK 1
+#endif  // !GEMMA_TOPK
+
 #include <stddef.h>
 
 namespace gcpp {
 
 static constexpr size_t kSeqLen = GEMMA_MAX_SEQLEN;
+static constexpr size_t kTopK = GEMMA_TOPK;
 
 struct ConfigGemma7B {
   static constexpr int kSeqLen = gcpp::kSeqLen;
@@ -38,7 +44,7 @@ struct ConfigGemma7B {
   static constexpr int kHeads = 16;
   static constexpr int kKVHeads = 16;  // standard MHA
   static constexpr int kQKVDim = 256;  // query size == key size == value size
-  static constexpr int kTopK = 1;
+  static constexpr int kTopK = gcpp::kTopK;
 };
 
 struct ConfigGemma2B {
@@ -50,7 +56,7 @@ struct ConfigGemma2B {
   static constexpr int kHeads = 8;
   static constexpr int kKVHeads = 8;   // TODO(austinvhuang): add MQA support
   static constexpr int kQKVDim = 256;  // query size == key size == value size
-  static constexpr int kTopK = 1;
+  static constexpr int kTopK = gcpp::kTopK;
 };
 
 }  // namespace gcpp