diff --git a/package/jemalloc/jemalloc.mk b/package/jemalloc/jemalloc.mk
index 1273f8a72a..f4d64851bf 100644
--- a/package/jemalloc/jemalloc.mk
+++ b/package/jemalloc/jemalloc.mk
@@ -11,5 +11,11 @@ JEMALLOC_LICENSE = BSD-2-Clause
 JEMALLOC_LICENSE_FILES = COPYING
 JEMALLOC_INSTALL_STAGING = YES
 
+# gcc bug internal compiler error: in merge_overlapping_regs, at
+# regrename.c:304. This bug is fixed since gcc 6.
+ifeq ($(BR2_or1k):$(BR2_TOOLCHAIN_GCC_AT_LEAST_6),y:)
+JEMALLOC_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -O0"
+endif
+
 $(eval $(autotools-package))
 $(eval $(host-autotools-package))