diff --git a/configure/os/CONFIG.Common.RTEMS b/configure/os/CONFIG.Common.RTEMS
index fe71e3110..89808a727 100644
--- a/configure/os/CONFIG.Common.RTEMS
+++ b/configure/os/CONFIG.Common.RTEMS
@@ -92,9 +92,9 @@ CODE_CFLAGS =
 CODE_CXXFLAGS =
 
 #--------------------------------------------------
-# RTEMS uses the inline keyword and non-ANSI functions (like strdup)
-CONFORM_CFLAGS_STRICT = 
-CONFORM_CXXFLAGS_STRICT =
+# RTEMS uses the inline keyword so -pedantic causes too many problems.
+CONFORM_CFLAGS_STRICT = -ansi
+CONFORM_CXXFLAGS_STRICT = -ansi
 
 #--------------------------------------------------
 # Command-line input support