diff --git a/src/system/libroot/posix/string/arch/x86_64/Jamfile b/src/system/libroot/posix/string/arch/x86_64/Jamfile
index e9324568a1..389f9c0146 100644
--- a/src/system/libroot/posix/string/arch/x86_64/Jamfile
+++ b/src/system/libroot/posix/string/arch/x86_64/Jamfile
@@ -1,5 +1,8 @@
 SubDir HAIKU_TOP src system libroot posix string arch x86_64 ;
 
+# Optimizations create infinite recursion otherwise.
+SubDirC++Flags -fno-builtin ;
+
 local architectureObject ;
 for architectureObject in [ MultiArchSubDirSetup x86_64 ] {
 	on $(architectureObject) {