diff --git a/src/lexer.c b/src/lexer.c
index 6ab40c4..9043d35 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -76,13 +76,11 @@ static int peekn_char(Lexer *ctx, unsigned int i)
 
     if (i > 0) {
         assert(i < LEN(b->buf));
-        memmove(b->buf, b->buf + (b->len - i) * sizeof(*b->buf),
-                i * sizeof(*b->buf));
+        memmove(b->buf, b->buf + (b->len - i), i * sizeof(*b->buf));
     }
 
     b->pos = 0;
-    b->len = fread(b->buf + i * sizeof(*b->buf), sizeof(*b->buf),
-                   LEN(b->buf) - i, b->f);
+    b->len = fread(b->buf + i, sizeof(*b->buf), LEN(b->buf) - i, b->f);
 
     if (b->len != LEN(b->buf)) {
         if (feof(b->f))
@@ -185,7 +183,7 @@ static int cmp_nextn(Lexer *ctx, int n, char *s)
         if (i >= n || *s == '\0' || c != *s)
             break;
 
-        s += sizeof(*s);
+        s++;
         i++;
     }
 
diff --git a/src/shell.c b/src/shell.c
index a410107..52359d2 100644
--- a/src/shell.c
+++ b/src/shell.c
@@ -23,7 +23,7 @@ char *prepend_helpers(char *str, size_t len)
     l = helpers_len;
     memcpy(b, scr_helpers_sh, l * sizeof(*b));
 
-    b += l * sizeof(*str);
+    b += l;
     l = len;
     memcpy(b, str, l * sizeof(*b));
 
diff --git a/src/utils.c b/src/utils.c
index c59298f..426b649 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -136,7 +136,7 @@ const char *get_ext(const char *path)
     const char *base;
 
     if ((base = strrchr(path, '/')))
-        base += sizeof(*base);
+        base++;
     else
         base = path;