diff --git a/firmware/libc/strstr.c b/firmware/libc/strstr.c
index ea1fe9e..d600bbe 100644
--- a/firmware/libc/strstr.c
+++ b/firmware/libc/strstr.c
@@ -18,22 +18,22 @@
 
 char *strstr(const char *s1, const char *s2)
 {
-	register const char *s = s1;
-	register const char *p = s2;
+    register const char *s = s1;
+    register const char *p = s2;
 
-	do {
-		if (!*p) {
-			return (char *) s1;;
-		}
-		if (*p == *s) {
-			++p;
-			++s;
-		} else {
-			p = s2;
-			if (!*s) {
-				return NULL;
-			}
-			s = ++s1;
-		}
-	} while (1);
+    do {
+        if (!*p) {
+            return (char *) s1;
+        }
+        if (*p == *s) {
+            ++p;
+            ++s;
+        } else {
+            p = s2;
+            if (!*s) {
+                return NULL;
+            }
+            s = ++s1;
+        }
+    } while (1);
 }