diff --git a/ext/opencv/cvhistogram.cpp b/ext/opencv/cvhistogram.cpp
index 28d530d..e88eb8b 100644
--- a/ext/opencv/cvhistogram.cpp
+++ b/ext/opencv/cvhistogram.cpp
@@ -123,7 +123,7 @@ VALUE
 rb_initialize(int argc, VALUE *argv, VALUE self)
 {
   VALUE _dims, _sizes, _type, _ranges, _uniform;
-  int dims, type, uniform;
+  int uniform;
   int* sizes;
   float** ranges = NULL;
 
diff --git a/ext/opencv/cvmat.cpp b/ext/opencv/cvmat.cpp
index 9a7f041..8861a4e 100644
--- a/ext/opencv/cvmat.cpp
+++ b/ext/opencv/cvmat.cpp
@@ -4415,7 +4415,6 @@ rb_filter2d(int argc, VALUE *argv, VALUE self)
   CvArr* self_ptr = CVARR(self);
   VALUE _dest = Qnil;
   try {
-    int type = cvGetElemType(kernel);
     _dest = new_mat_kind_object(cvGetSize(self_ptr), self);
     cvFilter2D(self_ptr, CVARR(_dest), kernel, NIL_P(_anchor) ? cvPoint(-1,-1) : VALUE_TO_CVPOINT(_anchor));
   }
diff --git a/ext/opencv/cvpoint3d32f.cpp b/ext/opencv/cvpoint3d32f.cpp
index 117fefe..f24e0f4 100644
--- a/ext/opencv/cvpoint3d32f.cpp
+++ b/ext/opencv/cvpoint3d32f.cpp
@@ -113,7 +113,6 @@ rb_allocate(VALUE klass)
 VALUE
 rb_initialize(int argc, VALUE *argv, VALUE self)
 {
-  VALUE obj, x, y, z;
   CvPoint3D32f *self_ptr = CVPOINT3D32F(self);
   switch (argc) {
   case 0:
diff --git a/ext/opencv/iplimage.cpp b/ext/opencv/iplimage.cpp
index 3ccd4a0..cf1d60e 100644
--- a/ext/opencv/iplimage.cpp
+++ b/ext/opencv/iplimage.cpp
@@ -377,7 +377,7 @@ compute_smoothness(const IplImage *pFourierImage, const double lowFreqRatio, con
   int low, high;
   IplImage *filteredFourierImage;
   int totalIntensity;
-  double sum, den, totalArea;
+  double den, totalArea;
   CvScalar scalar;
 
   if (!(pFourierImage->nChannels == 1 && pFourierImage->depth == 64) ) {
diff --git a/ext/opencv/pointset.cpp b/ext/opencv/pointset.cpp
index 2520470..a5886e3 100644
--- a/ext/opencv/pointset.cpp
+++ b/ext/opencv/pointset.cpp
@@ -202,9 +202,6 @@ __NAMESPACE_END_POINT_SET
 int
 CVPOINTS_FROM_POINT_SET(VALUE object, CvPoint **pointset)
 {
-  VALUE storage;
-  CvSeq *seq = 0;
-  CvPoint2D32f p32;
   if (rb_obj_is_kind_of(object, cCvSeq::rb_class())) {
     if (CV_IS_SEQ_POINT_SET(CVSEQ(object))) {
       *pointset = (CvPoint*)cvCvtSeqToArray(CVSEQ(object),