diff --git a/ChangeLog.d/fix-iar-compiler-warnings.txt b/ChangeLog.d/fix-iar-compiler-warnings.txt
new file mode 100644
index 0000000000..0dc2623f8f
--- /dev/null
+++ b/ChangeLog.d/fix-iar-compiler-warnings.txt
@@ -0,0 +1,2 @@
+Bugfix
+   * Fix IAR compiler warnings.
diff --git a/library/constant_time_impl.h b/library/constant_time_impl.h
index 0c3cde99d1..b251a664c0 100644
--- a/library/constant_time_impl.h
+++ b/library/constant_time_impl.h
@@ -189,8 +189,8 @@ static inline unsigned char mbedtls_ct_uchar_in_range_if(unsigned char low,
                                                          unsigned char c,
                                                          unsigned char t)
 {
-    const unsigned char co = (const unsigned char) mbedtls_ct_compiler_opaque(c);
-    const unsigned char to = (const unsigned char) mbedtls_ct_compiler_opaque(t);
+    const unsigned char co = (unsigned char) mbedtls_ct_compiler_opaque(c);
+    const unsigned char to = (unsigned char) mbedtls_ct_compiler_opaque(t);
 
     /* low_mask is: 0 if low <= c, 0x...ff if low > c */
     unsigned low_mask = ((unsigned) co - low) >> 8;