diff --git a/regress/unittests/bitmap/tests.c b/regress/unittests/bitmap/tests.c
index 5e02ca13d..8c630ac13 100644
--- a/regress/unittests/bitmap/tests.c
+++ b/regress/unittests/bitmap/tests.c
@@ -8,7 +8,9 @@
 #include <sys/types.h>
 #include <sys/param.h>
 #include <stdio.h>
+#ifdef HAVE_STDINT_H
 #include <stdint.h>
+#endif
 #include <stdlib.h>
 #include <string.h>
 
diff --git a/regress/unittests/hostkeys/test_iterate.c b/regress/unittests/hostkeys/test_iterate.c
index c681f19f3..2b2c6508f 100644
--- a/regress/unittests/hostkeys/test_iterate.c
+++ b/regress/unittests/hostkeys/test_iterate.c
@@ -8,7 +8,9 @@
 #include <sys/types.h>
 #include <sys/param.h>
 #include <stdio.h>
+#ifdef HAVE_STDINT_H
 #include <stdint.h>
+#endif
 #include <stdlib.h>
 #include <string.h>
 
diff --git a/regress/unittests/kex/test_kex.c b/regress/unittests/kex/test_kex.c
index 762f524fb..3151fa91f 100644
--- a/regress/unittests/kex/test_kex.c
+++ b/regress/unittests/kex/test_kex.c
@@ -8,7 +8,9 @@
 #include <sys/types.h>
 #include <sys/param.h>
 #include <stdio.h>
+#ifdef HAVE_STDINT_H
 #include <stdint.h>
+#endif
 #include <stdlib.h>
 #include <string.h>