diff --git a/CHANGELOG.md b/CHANGELOG.md
index f368129f..a9f84ab2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 ArduinoJson: change log
 =======================
 
+HEAD
+----
+
+* Set `ARDUINOJSON_EMBEDDED_MODE` to `1` on Nios II (issue #1657)
+
 v6.18.4 (2021-09-06)
 -------
 
diff --git a/src/ArduinoJson/Configuration.hpp b/src/ArduinoJson/Configuration.hpp
index 332abb6a..8e2c7d81 100644
--- a/src/ArduinoJson/Configuration.hpp
+++ b/src/ArduinoJson/Configuration.hpp
@@ -32,6 +32,7 @@
       || defined(__IAR_SYSTEMS_ICC__) /* IAR Embedded Workbench */ \
       || defined(__XC)                /* MPLAB XC compiler */      \
       || defined(__ARMCC_VERSION)     /* Keil ARM Compiler */      \
+      || defined(__NIOS2__)           /* Altera Nios II EDS */     \
       || defined(__AVR)               /* Atmel AVR8/GNU C Compiler */
 #    define ARDUINOJSON_EMBEDDED_MODE 1
 #  else