diff --git a/filters/karbon/pdf/PdfImport.cpp b/filters/karbon/pdf/PdfImport.cpp
--- a/filters/karbon/pdf/PdfImport.cpp
+++ b/filters/karbon/pdf/PdfImport.cpp
@@ -102,9 +102,6 @@
     delete globalParams;
     globalParams = 0;
 
-    // check for memory leaks
-    Object::memCheck(stderr);
-
     return KoFilter::OK;
 }
 
diff --git a/filters/karbon/pdf/SvgOutputDev.h b/filters/karbon/pdf/SvgOutputDev.h
--- a/filters/karbon/pdf/SvgOutputDev.h
+++ b/filters/karbon/pdf/SvgOutputDev.h
@@ -84,7 +84,7 @@
 private:
     QString convertPath(GfxPath *path);
     QString convertMatrix(const QMatrix &matrix);
-    QString convertMatrix(double * matrix);
+    QString convertMatrix(const double * matrix);
     QString printFill();
     QString printStroke();
 
diff --git a/filters/karbon/pdf/SvgOutputDev.cpp b/filters/karbon/pdf/SvgOutputDev.cpp
--- a/filters/karbon/pdf/SvgOutputDev.cpp
+++ b/filters/karbon/pdf/SvgOutputDev.cpp
@@ -212,7 +212,7 @@
            .arg(matrix.dx()) .arg(matrix.dy());
 }
 
-QString SvgOutputDev::convertMatrix(double * matrix)
+QString SvgOutputDev::convertMatrix(const double * matrix)
 {
     return QString("matrix(%1 %2 %3 %4 %5 %6)")
            .arg(matrix[0]).arg(matrix[1])
@@ -402,7 +402,7 @@
 
     QString str;
 
-    char * p = s->getCString();
+    const char * p = s->getCString();
     int len = s->getLength();
     CharCode code;
     Unicode *u = nullptr;
@@ -429,7 +429,7 @@
     double x = state->getCurX();
     double y = state->getCurY();
 
-    double * ctm = state->getCTM();
+    const double * ctm = state->getCTM();
     QMatrix transform(ctm[0], ctm[1], ctm[2], ctm[3], ctm[4], ctm[5]);
 
     QMatrix mirror;
@@ -522,7 +522,7 @@
         return;
     }
 
-    double * ctm = state->getCTM();
+    const double * ctm = state->getCTM();
     QMatrix m;
     m.setMatrix(ctm[0] / width, ctm[1] / width, -ctm[2] / height, -ctm[3] / height, ctm[2] + ctm[4], ctm[3] + ctm[5]);