diff --git a/dieharder/output.c b/dieharder/output.c
index 3496f9c..bca61d1 100644
--- a/dieharder/output.c
+++ b/dieharder/output.c
@@ -83,12 +83,12 @@ void output(Dtest *dtest,Test **test)
  if(strncmp("file_input",gsl_rng_name(rng),10) == 0){
    if(tflag & TFILE_RNG_STAT) {
      if(strncmp("file_input_raw",gsl_rng_name(rng),14) == 0){
-       fprintf(stdout,"# The %s %s %lu rands (%llu bytes) were used\n",
-               filename, gsl_rng_name(rng),file_input_get_rtot(rng),
+       fprintf(stdout,"# The %s %s %lld rands (%llu bytes) were used\n",
+               filename, gsl_rng_name(rng),(long long)file_input_get_rtot(rng),
                (unsigned long long)file_input_get_rtot(rng) * sizeof(uint));
      } else {
-       fprintf(stdout,"# The file %s %s %lu rands were used\n",
-               filename, gsl_rng_name(rng),file_input_get_rtot(rng));
+       fprintf(stdout,"# The file %s %s %lld rands were used\n",
+               filename, gsl_rng_name(rng),(long long)file_input_get_rtot(rng));
      }
      if(file_input_get_rewind_cnt(rng) == 0){
        fprintf(stdout,"# The file %s was rewound %u times\n",
diff --git a/dieharder/output_rnds.c b/dieharder/output_rnds.c
index d30573c..11f24db 100644
--- a/dieharder/output_rnds.c
+++ b/dieharder/output_rnds.c
@@ -23,7 +23,7 @@ void output_rnds()
  FILE *fp;
 
  if(verbose) {
-   fprintf(stderr,"# output_rnds: Dumping %lu rands\n",tsamples);
+   fprintf(stderr,"# output_rnds: Dumping %lld rands\n",(long long)tsamples);
  }
 
  /*
@@ -118,7 +118,7 @@ void output_rnds()
      fprintf(fp,"#==================================================================\n");
      fprintf(fp,"# generator %s  seed = %lu\n",gsl_rng_name(rng),seed);
      fprintf(fp,"#==================================================================\n");
-     fprintf(fp,"type: d\ncount: %lu\nnumbit: 32\n",tsamples);
+     fprintf(fp,"type: d\ncount: %lld\nnumbit: 32\n",(long long)tsamples);
      for(i=0;i<tsamples;i++){
        j = gsl_rng_get(rng);
        fprintf(fp,"%10u\n",j);
@@ -128,7 +128,7 @@ void output_rnds()
      fprintf(fp,"#==================================================================\n");
      fprintf(fp,"# generator %s  seed = %lu\n",gsl_rng_name(rng),seed);
      fprintf(fp,"#==================================================================\n");
-     fprintf(fp,"type: f\ncount: %lu\nnumbit: 32\n",tsamples);
+     fprintf(fp,"type: f\ncount: %lld\nnumbit: 32\n",(long long)tsamples);
      for(i=0;i<tsamples;i++){
        d = gsl_rng_uniform(rng);
        fprintf(fp,"%0.10f\n",d);
diff --git a/libdieharder/bits.c b/libdieharder/bits.c
index fa7c4d3..622be07 100644
--- a/libdieharder/bits.c
+++ b/libdieharder/bits.c
@@ -312,7 +312,7 @@ int get_int_bit(unsigned int i, unsigned int n)
   * Note
   */
  if(n < 0 || n > 8*sizeof(unsigned int)){
-   fprintf(stderr,"Error: bit offset %u exceeds length %lu of uint.\n",n,8*sizeof(unsigned int));
+   fprintf(stderr,"Error: bit offset %u exceeds length %zu of uint.\n",n,8*sizeof(unsigned int));
    exit(0);
  }
 
diff --git a/libdieharder/countx.c b/libdieharder/countx.c
index 68537af..2dc3953 100644
--- a/libdieharder/countx.c
+++ b/libdieharder/countx.c
@@ -232,7 +232,7 @@ int main_countx( int argc, char **argv)
   free(data);
 
   time(&z);
-  printf("number of seconds: %6lu\n", (size_t)(z-a));
+  printf("number of seconds: %6zu\n", (size_t)(z-a));
 
   return 0;
 
diff --git a/libdieharder/rgb_permutations.c b/libdieharder/rgb_permutations.c
index 478bbfb..8cb233c 100644
--- a/libdieharder/rgb_permutations.c
+++ b/libdieharder/rgb_permutations.c
@@ -113,7 +113,7 @@ int rgb_permutations(Test **test,int irun)
 
    MYDEBUG(D_RGB_PERMUTATIONS){
      for(i=0;i<k;i++) {
-       printf("# rgb_permutations: ps[%u] = %lu\n",i,ps[i]);
+       printf("# rgb_permutations: ps[%u] = %zu\n",i,ps[i]);
      }
    }
 
diff --git a/libdieharder/rng_file_input.c b/libdieharder/rng_file_input.c
index e70632a..c6fe2a9 100644
--- a/libdieharder/rng_file_input.c
+++ b/libdieharder/rng_file_input.c
@@ -170,7 +170,8 @@ static unsigned long int file_input_get (void *vstate)
    state->rptr++;
    state->rtot++;
    if(verbose){
-     fprintf(stdout,"# file_input() %lu: %lu/%lu -> %u\n", state->rtot, state->rptr,state->flen,(uint)iret);
+     fprintf(stdout,"# file_input() %lld: %lld/%lld -> %u\n",
+       (long long)state->rtot, (long long)state->rptr, (long long)state->flen, (uint)iret);
    }
 
    /*
@@ -277,8 +278,10 @@ static void file_input_set (void *vstate, unsigned long int s)
      state->rptr = 0;
      state->rewind_cnt++;
      if(verbose == D_FILE_INPUT || verbose == D_ALL){
-       fprintf(stderr,"# file_input(): Rewinding %s at rtot = %u\n", filename,(uint) state->rtot);
-       fprintf(stderr,"# file_input(): Rewind count = %u, resetting rptr = %lu\n",state->rewind_cnt,state->rptr);
+       fprintf(stderr,"# file_input(): Rewinding %s at rtot = %lld\n",
+         filename, (long long)state->rtot);
+       fprintf(stderr,"# file_input(): Rewind count = %u, resetting rptr = %lld\n",
+         state->rewind_cnt, (long long)state->rptr);
      }
    } else {
      return;
@@ -330,7 +333,7 @@ static void file_input_set (void *vstate, unsigned long int s)
        cnt++;
        if(verbose){ 
          fprintf(stdout,"# file_input(): cnt = %d\n",cnt);
-         fprintf(stdout,"# file_input(): state->flen set to %lu\n",state->flen);
+         fprintf(stdout,"# file_input(): state->flen set to %lld\n", (long long)state->flen);
        }
      }
      if(strncmp(splitbuf[0],"numbit",6) == 0){
diff --git a/libdieharder/rngav.c b/libdieharder/rngav.c
index 3893805..3d8b3c4 100644
--- a/libdieharder/rngav.c
+++ b/libdieharder/rngav.c
@@ -175,7 +175,7 @@ int main_rngav( int argc, char **argv)
 
   time(&z);
 
-  printf("number of seconds: %6lu\n", (size_t)(z-a));
+  printf("number of seconds: %6zu\n", (size_t)(z-a));
 
   return 0;
 
diff --git a/libdieharder/sts_monobit.c b/libdieharder/sts_monobit.c
index d88d4c8..5c4eff0 100644
--- a/libdieharder/sts_monobit.c
+++ b/libdieharder/sts_monobit.c
@@ -71,7 +71,7 @@ int sts_monobit(Test **test, int irun)
   * that if -b bits is specified, size will be "more than enough".
   */
  MYDEBUG(D_STS_MONOBIT) {
-   printf("# rgb_bitdist(): Generating %lu bits in bitstring",test[0]->tsamples*sizeof(uint)*8);
+   printf("# rgb_bitdist(): Generating %zu bits in bitstring",test[0]->tsamples*sizeof(uint)*8);
  }
  ptest.x = 0;