diff --git a/src/avclan/target/avr-attiny3216/CMakeLists.txt b/src/avclan/target/avr-attiny3216/CMakeLists.txt
index 00e96cd..6634849 100644
--- a/src/avclan/target/avr-attiny3216/CMakeLists.txt
+++ b/src/avclan/target/avr-attiny3216/CMakeLists.txt
@@ -77,7 +77,7 @@ set_property(CACHE USART_RXMODE PROPERTY STRINGS
 set(RTC_STATUS_PERIOD_MS 1000 CACHE STRING "Measured ms per nominal RTC status period (1000 = no correction)")
 
 # --- Firmware configuration options ----------------------------------------
-set(AVCLAN_FRAME_POOL_N 24 CACHE STRING "Pool allocator capacity for avclan::Frame (must be <= incoming/outgoing queue size)")
+set(AVCLAN_FRAME_POOL_N 14 CACHE STRING "Pool allocator capacity for avclan::Frame (must be <= incoming/outgoing queue size)")
 
 try_compile(LIBC_VERSION_TEST
     SOURCES "${CMAKE_SOURCE_DIR}/cmake/libc-version-test.cpp"
diff --git a/src/sniffer.cc b/src/sniffer.cc
index 2dfdf62..8172a93 100644
--- a/src/sniffer.cc
+++ b/src/sniffer.cc
@@ -20,7 +20,9 @@
 
 const char *const offon[] = {"OFF", "ON"};
 
-constexpr uint8_t CACHE_SIZE = 32;
+constexpr uint8_t CACHE_SIZE = 16;
+static_assert(CACHE_SIZE >= AVCLAN_FRAME_POOL_N,
+              "CACHE_SIZE must be >= avclan::Frame allocator pool capacity");
 
 using namespace avclan;