diff --git a/src/core/support/slice_buffer.c b/src/core/support/slice_buffer.c
index 17c0b6c..856d3a2 100644
--- a/src/core/support/slice_buffer.c
+++ b/src/core/support/slice_buffer.c
@@ -220,7 +220,7 @@
     return;
   }
   src_idx = 0;
-  for (;;) {
+  while (src_idx < src->capacity) {
     gpr_slice slice = src->slices[src_idx];
     size_t slice_len = GPR_SLICE_LENGTH(slice);
     if (n > slice_len) {