diff --git a/mongoose.h b/mongoose.h
index a943b465..347a7587 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -133,6 +133,8 @@ extern "C" {
 #include <sys/types.h>
 #include <time.h>
 
+#include <esp_timer.h>
+
 #define MG_PATH_MAX 128
 
 #endif
diff --git a/src/arch_esp32.h b/src/arch_esp32.h
index e5d8b6dc..2aade7be 100644
--- a/src/arch_esp32.h
+++ b/src/arch_esp32.h
@@ -17,6 +17,8 @@
 #include <sys/types.h>
 #include <time.h>
 
+#include <esp_timer.h>
+
 #define MG_PATH_MAX 128
 
 #endif