diff --git a/dbgen/Makefile b/dbgen/Makefile
index 3354e785..2b7641dc 100644
--- a/dbgen/Makefile
+++ b/dbgen/Makefile
@@ -110,7 +110,7 @@ DATABASE = POSTGRESQL
 MACHINE  = LINUX
 WORKLOAD = TPCH
 #
-CFLAGS	= -g -DDBNAME=\"dss\" -D$(MACHINE) -D$(DATABASE) -D$(WORKLOAD) -DRNG_TEST -D_FILE_OFFSET_BITS=64
+CFLAGS	= -std=gnu99 -g -DDBNAME=\"dss\" -D$(MACHINE) -D$(DATABASE) -D$(WORKLOAD) -DRNG_TEST -D_FILE_OFFSET_BITS=64
 LDFLAGS = -O
 # The OBJ,EXE and LIB macros will need to be changed for compilation under
 #  Windows NT