diff --git a/c/src/lib/libbsp/sparc/erc32/make/custom/erc32.cfg b/c/src/lib/libbsp/sparc/erc32/make/custom/erc32.cfg
index cefc924c41..7f972df9dd 100644
--- a/c/src/lib/libbsp/sparc/erc32/make/custom/erc32.cfg
+++ b/c/src/lib/libbsp/sparc/erc32/make/custom/erc32.cfg
@@ -15,4 +15,4 @@ RTEMS_CPU_MODEL=erc32
 CPU_CFLAGS = -mcpu=cypress
 
 # optimize flag: typically -O2
-CFLAGS_OPTIMIZE_V = -O2 -g
+CFLAGS_OPTIMIZE_V = -O0 -g