diff --git a/test/alt-from-fp32-value.cc b/test/alt-from-fp32-value.cc
index 33bf0fd..d30be0c 100644
--- a/test/alt-from-fp32-value.cc
+++ b/test/alt-from-fp32-value.cc
@@ -1,6 +1,7 @@
 #include <gtest/gtest.h>
 
 #include <cstdint>
+#include <iomanip>
 
 #include <fp16.h>
 #include <tables.h>
diff --git a/test/alt-to-fp32-bits.cc b/test/alt-to-fp32-bits.cc
index f5b61a5..2a232ba 100644
--- a/test/alt-to-fp32-bits.cc
+++ b/test/alt-to-fp32-bits.cc
@@ -1,6 +1,7 @@
 #include <gtest/gtest.h>
 
 #include <cstdint>
+#include <iomanip>
 
 #include <fp16.h>
 #include <tables.h>
diff --git a/test/alt-to-fp32-value.cc b/test/alt-to-fp32-value.cc
index b9d880e..40c49c4 100644
--- a/test/alt-to-fp32-value.cc
+++ b/test/alt-to-fp32-value.cc
@@ -2,6 +2,7 @@
 
 #include <cstdint>
 #include <cmath>
+#include <iomanip>
 
 #include <fp16.h>
 #include <tables.h>
diff --git a/test/bitcasts.cc b/test/bitcasts.cc
index b106935..cb1b564 100644
--- a/test/bitcasts.cc
+++ b/test/bitcasts.cc
@@ -1,6 +1,7 @@
 #include <gtest/gtest.h>
 
 #include <cstdint>
+#include <iomanip>
 
 #include <fp16.h>
 
diff --git a/test/ieee-from-fp32-value.cc b/test/ieee-from-fp32-value.cc
index ec9afe7..dceaf9a 100644
--- a/test/ieee-from-fp32-value.cc
+++ b/test/ieee-from-fp32-value.cc
@@ -1,6 +1,7 @@
 #include <gtest/gtest.h>
 
 #include <cstdint>
+#include <iomanip>
 
 #include <fp16.h>
 #include <tables.h>
diff --git a/test/ieee-to-fp32-bits.cc b/test/ieee-to-fp32-bits.cc
index 284e1b1..13b41aa 100644
--- a/test/ieee-to-fp32-bits.cc
+++ b/test/ieee-to-fp32-bits.cc
@@ -1,6 +1,7 @@
 #include <gtest/gtest.h>
 
 #include <cstdint>
+#include <iomanip>
 
 #include <fp16.h>
 #include <tables.h>
diff --git a/test/ieee-to-fp32-value.cc b/test/ieee-to-fp32-value.cc
index 5258e92..cbcbbf8 100644
--- a/test/ieee-to-fp32-value.cc
+++ b/test/ieee-to-fp32-value.cc
@@ -2,6 +2,7 @@
 
 #include <cstdint>
 #include <cmath>
+#include <iomanip>
 
 #include <fp16.h>
 #include <tables.h>