diff --git a/src/system/libroot/posix/glibc/regex/Jamfile b/src/system/libroot/posix/glibc/regex/Jamfile
index 173ce02f20..d79addf036 100644
--- a/src/system/libroot/posix/glibc/regex/Jamfile
+++ b/src/system/libroot/posix/glibc/regex/Jamfile
@@ -1,6 +1,7 @@
 SubDir HAIKU_TOP src system libroot posix glibc regex ;
 
 SubDirHdrs $(HAIKU_TOP) headers ;
+SubDirCcFlags -D_REGEX_RE_COMP ;
 
 KernelMergeObject posix_gnu_regex.o :
 	regex.c