diff --git a/ccmain/osdetect.cpp b/ccmain/osdetect.cpp
index c31c9b1b6..fba544928 100644
--- a/ccmain/osdetect.cpp
+++ b/ccmain/osdetect.cpp
@@ -130,7 +130,7 @@ int OSResults::get_best_script(int orientation_id) const {
 // Print the script scores for all possible orientations.
 void OSResults::print_scores(void) const {
   for (int i = 0; i < 4; ++i) {
-    printf("Orientation id #%d", i);
+    tprintf("Orientation id #%d", i);
     print_scores(i);
   }
 }
@@ -139,7 +139,7 @@ void OSResults::print_scores(void) const {
 void OSResults::print_scores(int orientation_id) const {
   for (int j = 0; j < kMaxNumberOfScripts; ++j) {
     if (scripts_na[orientation_id][j]) {
-      printf("%12s\t: %f\n", unicharset->get_script_from_script_id(j),
+      tprintf("%12s\t: %f\n", unicharset->get_script_from_script_id(j),
              scripts_na[orientation_id][j]);
     }
   }
@@ -284,13 +284,13 @@ int os_detect_blobs(BLOBNBOX_CLIST* blob_list, OSResults* osr,
 
   BLOBNBOX_C_IT filtered_it(blob_list);
   int real_max = MIN(filtered_it.length(), kMaxCharactersToTry);
-  // printf("Total blobs found = %d\n", blobs_total);
-  // printf("Number of blobs post-filtering = %d\n", filtered_it.length());
-  // printf("Number of blobs to try = %d\n", real_max);
+  // tprintf("Total blobs found = %d\n", blobs_total);
+  // tprintf("Number of blobs post-filtering = %d\n", filtered_it.length());
+  // tprintf("Number of blobs to try = %d\n", real_max);
 
   // If there are too few characters, skip this page entirely.
   if (real_max < kMinCharactersToTry / 2) {
-    printf("Too few characters. Skipping this page\n");
+    tprintf("Too few characters. Skipping this page\n");
     return 0;
   }
 
diff --git a/ccstruct/blobbox.h b/ccstruct/blobbox.h
index 6229365c5..da44bfbff 100644
--- a/ccstruct/blobbox.h
+++ b/ccstruct/blobbox.h
@@ -710,7 +710,7 @@ class TO_BLOCK:public ELIST_LINK
       for (row_it.mark_cycle_pt (); !row_it.cycled_list ();
       row_it.forward ()) {
         row = row_it.data ();
-        printf ("Row range (%g,%g), para_c=%g, blobcount=" INT32FORMAT
+        tprintf ("Row range (%g,%g), para_c=%g, blobcount=" INT32FORMAT
           "\n", row->min_y (), row->max_y (), row->parallel_c (),
           row->blob_list ()->length ());
       }
diff --git a/ccstruct/coutln.cpp b/ccstruct/coutln.cpp
index b4383707b..650299331 100644
--- a/ccstruct/coutln.cpp
+++ b/ccstruct/coutln.cpp
@@ -172,12 +172,12 @@ C_OUTLINE::C_OUTLINE(                     //constructor
       pos += srcline->step (stepindex);
       destpos = pos;
       destpos.rotate (rotation);
-      //  printf("%i %i %i %i ", destpos.x(), destpos.y(), pos.x(), pos.y());
+      //  tprintf("%i %i %i %i ", destpos.x(), destpos.y(), pos.x(), pos.y());
       while (destpos.x () != prevpos.x () || destpos.y () != prevpos.y ()) {
         dir = DIR128 (FCOORD (destpos - prevpos));
         dir += 64;                 //turn to step style
         new_step = dir.get_dir ();
-        //  printf(" %i\n", new_step);
+        //  tprintf(" %i\n", new_step);
         if (new_step & 31) {
           set_step(destindex++, dir + round1);
           prevpos += step(destindex - 1);
diff --git a/ccutil/tessdatamanager.cpp b/ccutil/tessdatamanager.cpp
index f23c81adc..721a7e3c1 100644
--- a/ccutil/tessdatamanager.cpp
+++ b/ccutil/tessdatamanager.cpp
@@ -217,7 +217,7 @@ bool TessdataManager::TessdataTypeFromFileSuffix(
       return true;
     }
   }
-  printf("TessdataManager can't determine which tessdata"
+  tprintf("TessdataManager can't determine which tessdata"
          " component is represented by %s\n", suffix);
   return false;
 }
@@ -239,7 +239,7 @@ bool TessdataManager::ExtractToFile(const char *filename) {
 
   FILE *output_file = fopen(filename, "wb");
   if (output_file == NULL) {
-    printf("Error openning %s\n", filename);
+    tprintf("Error openning %s\n", filename);
     exit(1);
   }
   inT64 begin_offset = ftell(GetDataFilePtr());
diff --git a/cube/search_column.cpp b/cube/search_column.cpp
index 7d5b1b206..9a042d016 100644
--- a/cube/search_column.cpp
+++ b/cube/search_column.cpp
@@ -179,7 +179,7 @@ SearchNode *SearchColumn::AddNode(LangModEdge *edge, int reco_cost,
     // because the langmod state is not unique
     if (edge->IsOOD() == false) {
       if (!node_hash_table_->Insert(edge, new_node)) {
-        printf("Hash table full!!!");
+        tprintf("Hash table full!!!");
         delete new_node;
         return NULL;
       }
diff --git a/textord/tordmain.cpp b/textord/tordmain.cpp
index 2194f44c1..aa259662f 100644
--- a/textord/tordmain.cpp
+++ b/textord/tordmain.cpp
@@ -346,12 +346,12 @@ float Textord::filter_noise_blobs(
       size_stats.add (height, 1);
   }
   max_height = size_stats.ile (textord_initialasc_ile);
-  //      printf("max_y=%g, min_y=%g, initial_x=%g, max_height=%g,",
+  //      tprintf("max_y=%g, min_y=%g, initial_x=%g, max_height=%g,",
   //              max_y,min_y,initial_x,max_height);
   max_height *= tesseract::CCStruct::kXHeightCapRatio;
   if (max_height > initial_x)
     initial_x = max_height;
-  //      printf(" ret=%g\n",initial_x);
+  //      tprintf(" ret=%g\n",initial_x);
   return initial_x;
 }