diff --git a/src/tests/allocs-by-size.c b/src/tests/allocs-by-size.c
index 4f80414b..8231be70 100644
--- a/src/tests/allocs-by-size.c
+++ b/src/tests/allocs-by-size.c
@@ -20,6 +20,7 @@
 
 #include "config.h"
 
+#include <errno.h>
 #include <glib/gi18n.h>
 #include <locale.h>
 #include <stddef.h>
diff --git a/src/tests/allocs-within-mark.c b/src/tests/allocs-within-mark.c
index 9e2bfaab..a3ba5b27 100644
--- a/src/tests/allocs-within-mark.c
+++ b/src/tests/allocs-within-mark.c
@@ -20,6 +20,7 @@
 
 #include "config.h"
 
+#include <errno.h>
 #include <glib/gi18n.h>
 #include <locale.h>
 #include <stdlib.h>
diff --git a/src/tests/cross-thread-frees.c b/src/tests/cross-thread-frees.c
index 6279e214..f931e61c 100644
--- a/src/tests/cross-thread-frees.c
+++ b/src/tests/cross-thread-frees.c
@@ -20,6 +20,7 @@
 
 #include "config.h"
 
+#include <errno.h>
 #include <glib.h>
 #include <stddef.h>
 #include <rax.h>
diff --git a/src/tests/find-temp-allocs.c b/src/tests/find-temp-allocs.c
index f4d35331..f47025e7 100644
--- a/src/tests/find-temp-allocs.c
+++ b/src/tests/find-temp-allocs.c
@@ -20,6 +20,7 @@
 
 #include "config.h"
 
+#include <errno.h>
 #include <glib.h>
 #include <sysprof-capture.h>
 
diff --git a/src/tests/memory-stack-stash.c b/src/tests/memory-stack-stash.c
index 7562c677..3a277ad7 100644
--- a/src/tests/memory-stack-stash.c
+++ b/src/tests/memory-stack-stash.c
@@ -20,6 +20,7 @@
 
 #include "config.h"
 
+#include <errno.h>
 #include <glib/gi18n.h>
 #include <locale.h>
 #include <stddef.h>
diff --git a/src/tests/show-page-usage.c b/src/tests/show-page-usage.c
index 9eb22ec5..e861578d 100644
--- a/src/tests/show-page-usage.c
+++ b/src/tests/show-page-usage.c
@@ -20,6 +20,7 @@
 
 #include "config.h"
 
+#include <errno.h>
 #include <cairo.h>
 #include <glib.h>
 #include <stddef.h>
diff --git a/src/tests/test-addr-decode.c b/src/tests/test-addr-decode.c
index dae7769e..db1b96b3 100644
--- a/src/tests/test-addr-decode.c
+++ b/src/tests/test-addr-decode.c
@@ -1,3 +1,4 @@
+#include <errno.h>
 #include <fcntl.h>
 #include <glib.h>
 #include <sysprof.h>
diff --git a/src/tests/test-addr-map.c b/src/tests/test-addr-map.c
index 918ba7ae..1e7f9b71 100644
--- a/src/tests/test-addr-map.c
+++ b/src/tests/test-addr-map.c
@@ -1,3 +1,4 @@
+#include <errno.h>
 #include <fcntl.h>
 #include <glib.h>
 #include <sysprof.h>
diff --git a/src/tests/test-resolvers.c b/src/tests/test-resolvers.c
index 7cb85154..aadef726 100644
--- a/src/tests/test-resolvers.c
+++ b/src/tests/test-resolvers.c
@@ -1,3 +1,4 @@
+#include <errno.h>
 #include <glib.h>
 #include <sysprof.h>