diff --git a/ccmain/pageiterator.h b/ccmain/pageiterator.h
index d3dfc78fb0..b8d1701e96 100644
--- a/ccmain/pageiterator.h
+++ b/ccmain/pageiterator.h
@@ -26,7 +26,6 @@
 
 class BlamerBundle;
 class C_BLOB_IT;
-class PBLOB_IT;
 class PAGE_RES;
 class PAGE_RES_IT;
 class WERD;
diff --git a/ccstruct/boxword.h b/ccstruct/boxword.h
index 6dc1719a4f..c8495b59aa 100644
--- a/ccstruct/boxword.h
+++ b/ccstruct/boxword.h
@@ -26,7 +26,6 @@
 
 class BLOCK;
 class DENORM;
-class PBLOB_LIST;
 struct TWERD;
 class UNICHARSET;
 class WERD;
diff --git a/ccstruct/otsuthr.cpp b/ccstruct/otsuthr.cpp
index 47128be186..3f23d5a821 100644
--- a/ccstruct/otsuthr.cpp
+++ b/ccstruct/otsuthr.cpp
@@ -97,7 +97,6 @@ void OtsuThreshold(const unsigned char* imagedata,
       }
     }
   }
-  delete[] histogramAllChannels;
 #else
   
   for (int ch = 0; ch < bytes_per_pixel; ++ch) {
@@ -136,6 +135,7 @@ void OtsuThreshold(const unsigned char* imagedata,
     }
   }
 #endif // USE_OPENCL
+  delete[] histogramAllChannels;
 
   if (!any_good_hivalue) {
     // Use the best of the ones that were not good enough.
diff --git a/classify/adaptmatch.cpp b/classify/adaptmatch.cpp
index 6051a95a02..816b92c400 100644
--- a/classify/adaptmatch.cpp
+++ b/classify/adaptmatch.cpp
@@ -1689,7 +1689,10 @@ UNICHAR_ID *Classify::GetAmbiguities(TBLOB *Blob,
   TrainingSample* sample =
       BlobToTrainingSample(*Blob, classify_nonlinear_norm, &fx_info,
                            &bl_features);
-  if (sample == NULL) return NULL;
+  if (sample == NULL) {
+    delete Results;
+    return NULL;
+  }
 
   CharNormClassifier(Blob, *sample, Results);
   delete sample;
diff --git a/classify/mastertrainer.cpp b/classify/mastertrainer.cpp
index 1e69da14b2..7726814fac 100644
--- a/classify/mastertrainer.cpp
+++ b/classify/mastertrainer.cpp
@@ -415,6 +415,7 @@ bool MasterTrainer::LoadXHeights(const char* filename) {
     if (xheights_[i] < 0)
       xheights_[i] = mean_xheight;
   }
+  fclose(f);
   return true;
 }  // LoadXHeights
 
diff --git a/cube/char_samp_set.cpp b/cube/char_samp_set.cpp
index de99b37438..65caa397a1 100644
--- a/cube/char_samp_set.cpp
+++ b/cube/char_samp_set.cpp
@@ -100,14 +100,17 @@ CharSampSet * CharSampSet::FromCharDumpFile(string file_name) {
   }
   // read and verify marker
   if (fread(&val32, 1, sizeof(val32), fp) != sizeof(val32)) {
+    fclose(fp);
     return NULL;
   }
   if (val32 != 0xfefeabd0) {
+    fclose(fp);
     return NULL;
   }
   // create an object
   CharSampSet *samp_set = new CharSampSet();
   if (samp_set == NULL) {
+    fclose(fp);
     return NULL;
   }
   if (samp_set->LoadCharSamples(fp) == false) {
diff --git a/cube/con_comp.cpp b/cube/con_comp.cpp
index f043253ad4..53b1a73b43 100644
--- a/cube/con_comp.cpp
+++ b/cube/con_comp.cpp
@@ -210,6 +210,7 @@ ConComp **ConComp::Segment(int max_hist_wnd, int *concomp_cnt) {
 
   // no segments, nothing to do
   if (seg_pt_cnt == 0) {
+    delete []x_seg_pt;
     return NULL;
   }
 
diff --git a/cube/cube_line_segmenter.cpp b/cube/cube_line_segmenter.cpp
index 3f0b762a3f..916992c577 100644
--- a/cube/cube_line_segmenter.cpp
+++ b/cube/cube_line_segmenter.cpp
@@ -689,6 +689,7 @@ bool CubeLineSegmenter::LineSegment() {
     // get the pix and box corresponding to the column
     Pix *pixt3 = pixaGetPix(pixad, col, L_CLONE);
     if (pixt3 == NULL) {
+      delete []col_order;
       return false;
     }
 
@@ -697,6 +698,7 @@ bool CubeLineSegmenter::LineSegment() {
     Pixa *pixac;
     Boxa *boxa2 = pixConnComp(pixt3, &pixac, 8);
     if (boxa2 == NULL) {
+      delete []col_order;
       return false;
     }
 
@@ -709,6 +711,7 @@ bool CubeLineSegmenter::LineSegment() {
     // add the lines
     if (AddLines(pixac) == true) {
       if (pixaaAddBox(columns_, col_box, L_CLONE) != 0) {
+        delete []col_order;
         return false;
       }
     }
diff --git a/opencl/opencl_device_selection.h b/opencl/opencl_device_selection.h
index 0ce3adbead..d28f2a278e 100644
--- a/opencl/opencl_device_selection.h
+++ b/opencl/opencl_device_selection.h
@@ -328,6 +328,7 @@ static ds_status readProFile(const char* fileName, char** content, size_t* conte
   rewind(input);
   binary = (char*)malloc(size);
   if(binary == NULL) {
+    fclose(input);
     return DS_FILE_ERROR;
   }
   fread(binary, sizeof(char), size, input);
diff --git a/wordrec/language_model.cpp b/wordrec/language_model.cpp
index b4cdffa127..487e2e94b0 100644
--- a/wordrec/language_model.cpp
+++ b/wordrec/language_model.cpp
@@ -601,6 +601,7 @@ bool LanguageModel::AddViterbiStateEntry(
       tprintf("Language model components very early pruned this entry\n");
     }
     delete ngram_info;
+    delete dawg_info;
     return false;
   }