diff --git a/ports/jxrlib/CMakeLists.txt b/ports/jxrlib/CMakeLists.txt
index d9ac84fb6..17f16bea4 100644
--- a/ports/jxrlib/CMakeLists.txt
+++ b/ports/jxrlib/CMakeLists.txt
@@ -62,7 +62,7 @@ JXR_MAKE_OBJ(ENC)
 
 add_library(jpegxr ${OBJ_ENC} ${OBJ_DEC} ${OBJ_SYS})
 set_property(TARGET jpegxr
-  PROPERTY COMPILE_DEFINITIONS __ANSI__ DISABLE_PERF_MEASUREMENT ${DEF_ENDIAN}
+  PROPERTY COMPILE_DEFINITIONS DISABLE_PERF_MEASUREMENT ${DEF_ENDIAN}
 )
 set_property(TARGET jpegxr PROPERTY LINK_INTERFACE_LIBRARIES "")
 install(TARGETS jpegxr
@@ -80,7 +80,7 @@ JXR_MAKE_OBJ(TEST)
 
 add_library(jxrglue ${OBJ_GLUE} ${OBJ_TEST})
 set_property(TARGET jxrglue
-  PROPERTY COMPILE_DEFINITIONS __ANSI__ DISABLE_PERF_MEASUREMENT ${DEF_ENDIAN}
+  PROPERTY COMPILE_DEFINITIONS DISABLE_PERF_MEASUREMENT ${DEF_ENDIAN}
 )
 set_property(TARGET jxrglue PROPERTY LINK_INTERFACE_LIBRARIES "")
 install(TARGETS jxrglue