diff --git a/c/bitvector.c b/c/bitvector.c
index 3d5b91c..3df9a13 100644
--- a/c/bitvector.c
+++ b/c/bitvector.c
@@ -30,6 +30,7 @@
 */
 
 #include <assert.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
diff --git a/c/int2str.c b/c/int2str.c
index 3a4c1a7..20c09c7 100644
--- a/c/int2str.c
+++ b/c/int2str.c
@@ -1,4 +1,6 @@
+#include <stdint.h>
 #include <stdlib.h>
+
 #include "dtypes.h"
 #include "utils.h"
 
diff --git a/c/lltinit.c b/c/lltinit.c
index 135dd7b..c259686 100644
--- a/c/lltinit.c
+++ b/c/lltinit.c
@@ -1,7 +1,7 @@
 #include <locale.h>
 #include <math.h>
 #include <stdarg.h>
-#include <stdarg.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 
diff --git a/c/random.c b/c/random.c
index 00faa55..5a694a9 100644
--- a/c/random.c
+++ b/c/random.c
@@ -3,6 +3,7 @@
 */
 
 #include <math.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>