diff --git a/extras/conf_test/avr.cpp b/extras/conf_test/avr.cpp
index eeac6c0d..769317a8 100644
--- a/extras/conf_test/avr.cpp
+++ b/extras/conf_test/avr.cpp
@@ -6,6 +6,8 @@ static_assert(ARDUINOJSON_USE_LONG_LONG == 0, "ARDUINOJSON_USE_LONG_LONG");
 
 static_assert(ARDUINOJSON_SLOT_ID_SIZE == 1, "ARDUINOJSON_SLOT_ID_SIZE");
 
+static_assert(ARDUINOJSON_POOL_CAPACITY == 16, "ARDUINOJSON_POOL_CAPACITY");
+
 static_assert(ARDUINOJSON_LITTLE_ENDIAN == 1, "ARDUINOJSON_LITTLE_ENDIAN");
 
 static_assert(ARDUINOJSON_USE_DOUBLE == 0, "ARDUINOJSON_USE_DOUBLE");
diff --git a/extras/conf_test/esp8266.cpp b/extras/conf_test/esp8266.cpp
index 18d0d753..b37bfd67 100644
--- a/extras/conf_test/esp8266.cpp
+++ b/extras/conf_test/esp8266.cpp
@@ -4,6 +4,8 @@ static_assert(ARDUINOJSON_USE_LONG_LONG == 1, "ARDUINOJSON_USE_LONG_LONG");
 
 static_assert(ARDUINOJSON_SLOT_ID_SIZE == 2, "ARDUINOJSON_SLOT_ID_SIZE");
 
+static_assert(ARDUINOJSON_POOL_CAPACITY == 128, "ARDUINOJSON_POOL_CAPACITY");
+
 static_assert(ARDUINOJSON_LITTLE_ENDIAN == 1, "ARDUINOJSON_LITTLE_ENDIAN");
 
 static_assert(ARDUINOJSON_USE_DOUBLE == 1, "ARDUINOJSON_USE_DOUBLE");
diff --git a/extras/conf_test/x64.cpp b/extras/conf_test/x64.cpp
index c7ce9ae2..df6b044b 100644
--- a/extras/conf_test/x64.cpp
+++ b/extras/conf_test/x64.cpp
@@ -4,6 +4,8 @@ static_assert(ARDUINOJSON_USE_LONG_LONG == 1, "ARDUINOJSON_USE_LONG_LONG");
 
 static_assert(ARDUINOJSON_SLOT_ID_SIZE == 4, "ARDUINOJSON_SLOT_ID_SIZE");
 
+static_assert(ARDUINOJSON_POOL_CAPACITY == 256, "ARDUINOJSON_POOL_CAPACITY");
+
 static_assert(ARDUINOJSON_LITTLE_ENDIAN == 1, "ARDUINOJSON_LITTLE_ENDIAN");
 
 static_assert(ARDUINOJSON_USE_DOUBLE == 1, "ARDUINOJSON_USE_DOUBLE");
diff --git a/extras/conf_test/x86.cpp b/extras/conf_test/x86.cpp
index a5f335e8..9dff8f17 100644
--- a/extras/conf_test/x86.cpp
+++ b/extras/conf_test/x86.cpp
@@ -4,6 +4,8 @@ static_assert(ARDUINOJSON_USE_LONG_LONG == 1, "ARDUINOJSON_USE_LONG_LONG");
 
 static_assert(ARDUINOJSON_SLOT_ID_SIZE == 2, "ARDUINOJSON_SLOT_ID_SIZE");
 
+static_assert(ARDUINOJSON_POOL_CAPACITY == 128, "ARDUINOJSON_POOL_CAPACITY");
+
 static_assert(ARDUINOJSON_LITTLE_ENDIAN == 1, "ARDUINOJSON_LITTLE_ENDIAN");
 
 static_assert(ARDUINOJSON_USE_DOUBLE == 1, "ARDUINOJSON_USE_DOUBLE");
diff --git a/src/ArduinoJson/Configuration.hpp b/src/ArduinoJson/Configuration.hpp
index 21006bc3..cf6fb383 100644
--- a/src/ArduinoJson/Configuration.hpp
+++ b/src/ArduinoJson/Configuration.hpp
@@ -110,9 +110,9 @@
 
 // Capacity of each variant pool (in slots)
 #ifndef ARDUINOJSON_POOL_CAPACITY
-#  if ARDUINOJSON_SIZEOF_POINTER <= 2
+#  if ARDUINOJSON_SLOT_ID_SIZE == 1
 #    define ARDUINOJSON_POOL_CAPACITY 16  // 96 bytes
-#  elif ARDUINOJSON_SIZEOF_POINTER == 4
+#  elif ARDUINOJSON_SLOT_ID_SIZE == 2
 #    define ARDUINOJSON_POOL_CAPACITY 128  // 1024 bytes
 #  else
 #    define ARDUINOJSON_POOL_CAPACITY 256  // 4096 bytes