diff --git a/examples/rust-gcoap/Makefile b/examples/rust-gcoap/Makefile
index dc8725b150..9fa9de2543 100644
--- a/examples/rust-gcoap/Makefile
+++ b/examples/rust-gcoap/Makefile
@@ -34,10 +34,13 @@ DEVELHELP ?= 1
 # Change this to 0 show compiler invocation lines by default:
 QUIET ?= 1
 
-# Add 3k extra stack: The Rust examples take more of it than gcoap expects,
+# Add 8k extra stack: The Rust examples take more of it than gcoap expects,
 # presumably because the example use the standard library's sting formatting
 # instead of one of the more optimized formatters.
-CFLAGS += -DGCOAP_STACK_SIZE='(THREAD_STACKSIZE_DEFAULT+DEBUG_EXTRA_STACKSIZE+sizeof(coap_pkt_t)+1024)'
+CFLAGS += -DGCOAP_STACK_SIZE='(THREAD_STACKSIZE_DEFAULT+DEBUG_EXTRA_STACKSIZE+sizeof(coap_pkt_t)+8192)'
+# This thread needs some more stack for printing the addresses, once more being
+# hit by string formatting.
+CFLAGS += -DTHREAD_STACKSIZE_MAIN='(THREAD_STACKSIZE_DEFAULT+THREAD_EXTRA_STACKSIZE_PRINTF+2048)'
 
 # The name of crate (as per Cargo.toml package name, but with '-' replaced with '_')
 APPLICATION_RUST_MODULE = rust_gcoap