diff --git a/common/speculative.cpp b/common/speculative.cpp
index e6ec8f6ac62f..5ec3f621d2ad 100644
--- a/common/speculative.cpp
+++ b/common/speculative.cpp
@@ -12,6 +12,7 @@
 #include "../src/llama-ext.h" // staging API: llama_set_embeddings_nextn / llama_get_embeddings_nextn_ith (used by MTP)
 
 #include <algorithm>
+#include <cmath>
 #include <cassert>
 #include <cstring>
 #include <iomanip>