diff --git a/src/rla.imageio/rlaoutput.cpp b/src/rla.imageio/rlaoutput.cpp
index 9cec8a8076..bd0a31ed41 100644
--- a/src/rla.imageio/rlaoutput.cpp
+++ b/src/rla.imageio/rlaoutput.cpp
@@ -31,6 +31,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cmath>
+#include <time.h>
 
 #include "dassert.h"
 #include "typedesc.h"
diff --git a/src/tiff.imageio/tiffoutput.cpp b/src/tiff.imageio/tiffoutput.cpp
index 291e261e0e..850efd3c22 100644
--- a/src/tiff.imageio/tiffoutput.cpp
+++ b/src/tiff.imageio/tiffoutput.cpp
@@ -33,6 +33,7 @@
 #include <cstdlib>
 #include <cmath>
 #include <iostream>
+#include <time.h>
 
 #include <tiffio.h>