diff --git a/src/core/vm.c b/src/core/vm.c
index 2ed67d54..ead97d68 100644
--- a/src/core/vm.c
+++ b/src/core/vm.c
@@ -30,6 +30,8 @@
 #include "util.h"
 #endif
 
+#include <math.h>
+
 /* VM state */
 JANET_THREAD_LOCAL JanetTable *janet_vm_core_env;
 JANET_THREAD_LOCAL JanetTable *janet_vm_registry;