diff --git a/modules/ml/src/svm.cpp b/modules/ml/src/svm.cpp
index 6189dc0ba2..faa3a8fca5 100644
--- a/modules/ml/src/svm.cpp
+++ b/modules/ml/src/svm.cpp
@@ -1736,7 +1736,7 @@ bool CvSVM::train_auto( const CvMat* _train_data, const CvMat* _responses,
     block_size = MAX( block_size, sample_count*2*(int)sizeof(double) + 1024 );
     block_size = MAX( block_size, sample_size*2 + 1024 );
 
-    CV_CALL(storage = cvCreateMemStorage(block_size));
+    CV_CALL( storage = cvCreateMemStorage(block_size + sizeof(CvMemBlock) + sizeof(CvSeqBlock)));
     CV_CALL(temp_storage = cvCreateChildMemStorage(storage));
     CV_CALL(alpha = (double*)cvMemStorageAlloc(temp_storage, sample_count*sizeof(double)));
 
@@ -2444,7 +2444,8 @@ void CvSVM::read( CvFileStorage* fs, CvFileNode* svm_node )
     block_size = MAX( block_size, sv_total*(int)sizeof(CvSVMKernelRow));
     block_size = MAX( block_size, sv_total*2*(int)sizeof(double));
     block_size = MAX( block_size, var_all*(int)sizeof(double));
-    CV_CALL( storage = cvCreateMemStorage( block_size ));
+
+    CV_CALL( storage = cvCreateMemStorage(block_size + sizeof(CvMemBlock) + sizeof(CvSeqBlock)));
     CV_CALL( sv = (float**)cvMemStorageAlloc( storage,
                                 sv_total*sizeof(sv[0]) ));