diff --git a/src/Makefile b/src/Makefile
index ec97736..2a630be 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -20,7 +20,7 @@ ALL_CFLAGS := $(INCLUDES)
 
 SHARED_CFLAGS += -fPIC -fvisibility=hidden -DSHARED
 
-CFLAGS ?= -g -O2 -Werror -Wall
+CFLAGS ?= -g -O2 -Werror -Wall -std=gnu89
 ALL_CFLAGS += $(CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
 ALL_LDFLAGS += $(LDFLAGS)
 ifdef NO_PKG_CONFIG