diff --git a/src/core/ev.c b/src/core/ev.c
index ac3df101..6f8da2d8 100644
--- a/src/core/ev.c
+++ b/src/core/ev.c
@@ -36,6 +36,7 @@
 #ifdef JANET_WINDOWS
 
 #include <windows.h>
+#include <math.h>
 
 #else
 
diff --git a/src/core/net.c b/src/core/net.c
index 5d05b235..f8ca27ff 100644
--- a/src/core/net.c
+++ b/src/core/net.c
@@ -47,6 +47,7 @@
 #include <netinet/tcp.h>
 #include <netdb.h>
 #include <fcntl.h>
+#include <math.h>
 #endif
 
 /*