diff --git a/udivdi3.c b/udivdi3.c
index 5caabf4..b86b687 100644
--- a/udivdi3.c
+++ b/udivdi3.c
@@ -21,7 +21,7 @@
 COMPILER_RT_ABI du_int __udivdi3(du_int n, du_int d) {
   const unsigned N = sizeof(du_int) * CHAR_BIT;
   // d == 0 cases are unspecified.
-  unsigned sr = (d ? clz(d) : N) - (n ? clz(n) : N);
+  unsigned sr = (d ? (unsigned)clz(d) : N) - (n ? (unsigned)clz(n) : N);
   // 0 <= sr <= N - 1 or sr is very large.
   if (sr > N - 1) // n < d
     return 0;
diff --git a/udivsi3.c b/udivsi3.c
index 0e5d76d..07d8ceb 100644
--- a/udivsi3.c
+++ b/udivsi3.c
@@ -21,7 +21,7 @@
 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d) {
   const unsigned N = sizeof(su_int) * CHAR_BIT;
   // d == 0 cases are unspecified.
-  unsigned sr = (d ? clz(d) : N) - (n ? clz(n) : N);
+  unsigned sr = (d ? (unsigned)clz(d) : N) - (n ? (unsigned)clz(n) : N);
   // 0 <= sr <= N - 1 or sr is very large.
   if (sr > N - 1) // n < d
     return 0;
diff --git a/umoddi3.c b/umoddi3.c
index 3f843ea..87cc2bf 100644
--- a/umoddi3.c
+++ b/umoddi3.c
@@ -21,7 +21,7 @@
 COMPILER_RT_ABI du_int __umoddi3(du_int n, du_int d) {
   const unsigned N = sizeof(du_int) * CHAR_BIT;
   // d == 0 cases are unspecified.
-  unsigned sr = (d ? clz(d) : N) - (n ? clz(n) : N);
+  unsigned sr = (d ? (unsigned)clz(d) : N) - (n ? (unsigned)clz(n) : N);
   // 0 <= sr <= N - 1 or sr is very large.
   if (sr > N - 1) // n < d
     return n;
diff --git a/umodsi3.c b/umodsi3.c
index 798c395..bd8c8e4 100644
--- a/umodsi3.c
+++ b/umodsi3.c
@@ -21,7 +21,7 @@
 COMPILER_RT_ABI su_int __umodsi3(su_int n, su_int d) {
   const unsigned N = sizeof(su_int) * CHAR_BIT;
   // d == 0 cases are unspecified.
-  unsigned sr = (d ? clz(d) : N) - (n ? clz(n) : N);
+  unsigned sr = (d ? (unsigned)clz(d) : N) - (n ? (unsigned)clz(n) : N);
   // 0 <= sr <= N - 1 or sr is very large.
   if (sr > N - 1) // n < d
     return n;