diff --git a/Rakefile b/Rakefile
index 464e861..28c9d73 100644
--- a/Rakefile
+++ b/Rakefile
@@ -49,7 +49,7 @@ cflags = [ENV["CFLAGS"]]
 # optimize for size
 cflags << "-Os"
 # add debug symbols (remove for smaller release)
-cflags << "-ggdb"
+cflags << "-ggdb3"
 # use C99 (supported by most an sufficient)
 cflags << "-std=c99"
 # have strict warning (for better code)