diff --git a/configure/os/CONFIG.Common.RTEMS b/configure/os/CONFIG.Common.RTEMS
index bc2d62e27..b1a97085a 100644
--- a/configure/os/CONFIG.Common.RTEMS
+++ b/configure/os/CONFIG.Common.RTEMS
@@ -92,9 +92,10 @@ CODE_CFLAGS =
 CODE_CXXFLAGS =
 
 #--------------------------------------------------
-# RTEMS uses the inline keyword so -pedantic causes too many problems.
-CONFORM_CFLAGS_STRICT = -ansi
-CONFORM_CXXFLAGS_STRICT = -ansi
+# RTEMS uses the inline keyword and some non-ANSI C library functions
+# so -ansi -pedantic causes too many problems.
+CONFORM_CFLAGS_STRICT =
+CONFORM_CXXFLAGS_STRICT =
 
 #--------------------------------------------------
 # Command-line input support