diff --git a/Makefile b/Makefile
index 40d7826e87..3cb514a259 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ include config.mak
 
 VPATH=$(SRC_PATH)
 
-CFLAGS= $(OPTFLAGS) -Wall -g -I. -I$(SRC_PATH) -I$(SRC_PATH)/libavcodec -I$(SRC_PATH)/libav
+CFLAGS= $(OPTFLAGS) -Wall -g -I. -I$(SRC_PATH) -I$(SRC_PATH)/libavcodec -I$(SRC_PATH)/libav -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE
 LDFLAGS= -g
 ifeq ($(TARGET_GPROF),yes)
 CFLAGS+=-p
diff --git a/libav/Makefile b/libav/Makefile
index a0a5008912..48dacabe5d 100644
--- a/libav/Makefile
+++ b/libav/Makefile
@@ -6,7 +6,7 @@ include ../config.mak
 
 VPATH=$(SRC_PATH)/libav
 
-CFLAGS= $(OPTFLAGS) -Wall -g -I.. -I$(SRC_PATH) -I$(SRC_PATH)/libavcodec -DHAVE_AV_CONFIG_H
+CFLAGS= $(OPTFLAGS) -Wall -g -I.. -I$(SRC_PATH) -I$(SRC_PATH)/libavcodec -DHAVE_AV_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE
 
 OBJS= utils.o 
 
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 3efa591919..6d54abb953 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -7,7 +7,7 @@ include ../config.mak
 VPATH=$(SRC_PATH)/libavcodec
 
 # NOTE: -I.. is needed to include config.h
-CFLAGS= $(OPTFLAGS) -Wall -g -DHAVE_AV_CONFIG_H -I..
+CFLAGS= $(OPTFLAGS) -Wall -g -DHAVE_AV_CONFIG_H -I.. -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE
 LDFLAGS= -g
 
 OBJS= common.o utils.o mem.o allcodecs.o \