diff --git a/package/fluent-bit/fluent-bit.mk b/package/fluent-bit/fluent-bit.mk
index e51322aad6..00a8904c55 100644
--- a/package/fluent-bit/fluent-bit.mk
+++ b/package/fluent-bit/fluent-bit.mk
@@ -12,8 +12,6 @@ FLUENT_BIT_CPE_ID_VENDOR = treasuredata
 FLUENT_BIT_CPE_ID_PRODUCT = fluent_bit
 FLUENT_BIT_DEPENDENCIES = host-bison host-flex libyaml openssl
 
-FLUENT_BIT_CFLAGS = $(TARGET_CFLAGS)
-
 FLUENT_BIT_CONF_OPTS += \
 	-DFLB_DEBUG=No \
 	-DFLB_RELEASE=Yes \
@@ -55,11 +53,6 @@ FLUENT_BIT_CONF_OPTS += \
 FLUENT_BIT_CONF_OPTS += \
 	-DCMAKE_INSTALL_SYSCONFDIR="/etc/"
 
-# Undefining _FILE_OFFSET_BITS here because of a "bug" with glibc fts.h
-# large file support.
-# https://bugzilla.redhat.com/show_bug.cgi?id=574992
-FLUENT_BIT_CFLAGS += -U_FILE_OFFSET_BITS
-
 ifeq ($(BR2_PACKAGE_LIBEXECINFO),y)
 FLUENT_BIT_DEPENDENCIES += libexecinfo
 FLUENT_BIT_LDFLAGS += -lexecinfo
@@ -76,8 +69,7 @@ FLUENT_BIT_LDFLAGS += -latomic
 endif
 
 FLUENT_BIT_CONF_OPTS += \
-	-DCMAKE_EXE_LINKER_FLAGS="$(FLUENT_BIT_LDFLAGS)" \
-	-DCMAKE_C_FLAGS="$(FLUENT_BIT_CFLAGS)"
+	-DCMAKE_EXE_LINKER_FLAGS="$(FLUENT_BIT_LDFLAGS)"
 
 define FLUENT_BIT_INSTALL_INIT_SYSV
 	$(INSTALL) -D -m 0755 package/fluent-bit/S99fluent-bit \