diff --git a/examples/gf_example_2.c b/examples/gf_example_2.c
index e98774a..576d9a5 100644
--- a/examples/gf_example_2.c
+++ b/examples/gf_example_2.c
@@ -28,8 +28,8 @@ int main(int argc, char **argv)
 {
   uint32_t a, b, c;
   uint8_t *r1, *r2;
-  uint16_t *r16;
-  uint32_t *r32;
+  uint16_t *r16 = NULL;
+  uint32_t *r32 = NULL;
   int w, i;
   gf_t gf;
 
diff --git a/src/gf.c b/src/gf.c
index c14f03e..5a71ad6 100644
--- a/src/gf.c
+++ b/src/gf.c
@@ -767,7 +767,7 @@ void gf_set_region_data(gf_region_data *rd,
   int xor,
   int align)
 {
-  gf_internal_t *h;
+  gf_internal_t *h = NULL;
   int wb;
   uint32_t a;
   unsigned long uls, uld;
diff --git a/src/gf_w8.c b/src/gf_w8.c
index b171639..44c42a5 100644
--- a/src/gf_w8.c
+++ b/src/gf_w8.c
@@ -799,9 +799,9 @@ gf_w8_logzero_multiply_region(gf_t *gf, void *src, void *dest, uint32_t val, int
 int gf_w8_log_init(gf_t *gf)
 {
   gf_internal_t *h;
-  struct gf_w8_logtable_data *ltd;
-  struct gf_w8_logzero_table_data *ztd;
-  struct gf_w8_logzero_small_table_data *std;
+  struct gf_w8_logtable_data *ltd = NULL;
+  struct gf_w8_logzero_table_data *ztd = NULL;
+  struct gf_w8_logzero_small_table_data *std = NULL;
   uint8_t *alt;
   uint8_t *inv;
   int i, b;
diff --git a/test/gf_unit.c b/test/gf_unit.c
index cf466fe..22d4905 100644
--- a/test/gf_unit.c
+++ b/test/gf_unit.c
@@ -80,6 +80,9 @@ int main(int argc, char **argv)
   uint16_t a16, b16, c16, d16, *log16, *alog16;
   char as[50], bs[50], cs[50], ds[50], ais[50], bis[50];
   uint32_t mask;
+  uint8_t a8, b8, c8, *mult4 = NULL, *mult8 = NULL;
+  uint16_t a16, b16, c16, *log16 = NULL, *alog16 = NULL;
+  uint32_t mask = 0;
   char *ra, *rb, *rc, *rd, *target;
   int align;
 
diff --git a/tools/gf_inline_time.c b/tools/gf_inline_time.c
index e64f0b3..193c004 100644
--- a/tools/gf_inline_time.c
+++ b/tools/gf_inline_time.c
@@ -62,8 +62,8 @@ int main(int argc, char **argv)
   int w, j, i, size, iterations;
   gf_t      gf;
   double timer, elapsed, dnum, num;
-  uint8_t *ra, *rb, *mult4, *mult8;
-  uint16_t *ra16, *rb16, *log16, *alog16;
+  uint8_t *ra = NULL, *rb = NULL, *mult4, *mult8;
+  uint16_t *ra16 = NULL, *rb16 = NULL, *log16, *alog16;
   time_t t0;
   
   if (argc != 5) usage(NULL);