1 files changed, 4 insertions, 4 deletions

diff --git a/lib/libc/string/strstr.c b/lib/libc/string/strstr.c
index d726aff1f1c3..72f8abb9e200 100644
--- a/lib/libc/string/strstr.c
+++ b/lib/libc/string/strstr.c
@@ -40,8 +40,8 @@ twobyte_strstr(const unsigned char *h, const unsigned char *n)
 static char *
 threebyte_strstr(const unsigned char *h, const unsigned char *n)
 {
-	uint32_t nw = n[0] << 24 | n[1] << 16 | n[2] << 8;
-	uint32_t hw = h[0] << 24 | h[1] << 16 | h[2] << 8;
+	uint32_t nw = (uint32_t)n[0] << 24 | n[1] << 16 | n[2] << 8;
+	uint32_t hw = (uint32_t)h[0] << 24 | h[1] << 16 | h[2] << 8;
 	for (h += 2; *h && hw != nw; hw = (hw | *++h) << 8)
 		;
 	return *h ? (char *)h - 2 : 0;
@@ -50,8 +50,8 @@ threebyte_strstr(const unsigned char *h, const unsigned char *n)
 static char *
 fourbyte_strstr(const unsigned char *h, const unsigned char *n)
 {
-	uint32_t nw = n[0] << 24 | n[1] << 16 | n[2] << 8 | n[3];
-	uint32_t hw = h[0] << 24 | h[1] << 16 | h[2] << 8 | h[3];
+	uint32_t nw = (uint32_t)n[0] << 24 | n[1] << 16 | n[2] << 8 | n[3];
+	uint32_t hw = (uint32_t)h[0] << 24 | h[1] << 16 | h[2] << 8 | h[3];
 	for (h += 3; *h && hw != nw; hw = hw << 8 | *++h)
 		;
 	return *h ? (char *)h - 3 : 0;