diff --git a/librz/analysis/fcn.c b/librz/analysis/fcn.c
index a76f2335746..d36cd6ebe07 100644
--- a/librz/analysis/fcn.c
+++ b/librz/analysis/fcn.c
@@ -8,7 +8,7 @@
 #include <rz_util.h>
 #include <rz_list.h>
 
-#define READ_AHEAD 1
+#define READ_AHEAD 0
 #define SDB_KEY_BB "bb.0x%" PFMT64x ".0x%" PFMT64x
 // XXX must be configurable by the user
 #define JMPTBL_LEA_SEARCH_SZ 64