diff --git a/src/pdu.c b/src/pdu.c
index 7fa7c7f3..a5cd2b9d 100644
--- a/src/pdu.c
+++ b/src/pdu.c
@@ -12,7 +12,10 @@
 # include <assert.h>
 #endif
 
+#if defined(HAVE_LIMITS_H)
 #include <limits.h>
+#endif
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
diff --git a/src/uri.c b/src/uri.c
index f7a25f0c..b111a0ee 100644
--- a/src/uri.c
+++ b/src/uri.c
@@ -12,6 +12,10 @@
 # include <assert.h>
 #endif
 
+#if defined(HAVE_LIMITS_H)
+#include <limits.h>
+#endif
+
 #include <stdio.h>
 #include <string.h>
 #include <ctype.h>