diff --git a/libqpdf/ClosedFileInputSource.cc b/libqpdf/ClosedFileInputSource.cc
index 63357886..e9c9b3bd 100644
--- a/libqpdf/ClosedFileInputSource.cc
+++ b/libqpdf/ClosedFileInputSource.cc
@@ -11,10 +11,7 @@ ClosedFileInputSource::Members::Members(char const* filename) :
 
 ClosedFileInputSource::Members::~Members()
 {
-    if (fis)
-    {
-        delete fis;
-    }
+    delete fis;
 }
 
 ClosedFileInputSource::ClosedFileInputSource(char const* filename) :
diff --git a/libqpdf/Pl_Flate.cc b/libqpdf/Pl_Flate.cc
index 3becc135..4cd48046 100644
--- a/libqpdf/Pl_Flate.cc
+++ b/libqpdf/Pl_Flate.cc
@@ -31,11 +31,8 @@ Pl_Flate::Pl_Flate(char const* identifier, Pipeline* next,
 
 Pl_Flate::~Pl_Flate()
 {
-    if (this->outbuf)
-    {
-	delete [] this->outbuf;
-	this->outbuf = 0;
-    }
+    delete [] this->outbuf;
+    this->outbuf = 0;
 
     if (this->initialized)
     {
diff --git a/libqpdf/Pl_RC4.cc b/libqpdf/Pl_RC4.cc
index 87c17f83..407490ca 100644
--- a/libqpdf/Pl_RC4.cc
+++ b/libqpdf/Pl_RC4.cc
@@ -13,11 +13,8 @@ Pl_RC4::Pl_RC4(char const* identifier, Pipeline* next,
 
 Pl_RC4::~Pl_RC4()
 {
-    if (this->outbuf)
-    {
-	delete [] this->outbuf;
-	this->outbuf = 0;
-    }
+    delete [] this->outbuf;
+    this->outbuf = 0;
 }
 
 void
@@ -47,10 +44,7 @@ Pl_RC4::write(unsigned char* data, size_t len)
 void
 Pl_RC4::finish()
 {
-    if (this->outbuf)
-    {
-	delete [] this->outbuf;
-	this->outbuf = 0;
-    }
+    delete [] this->outbuf;
+    this->outbuf = 0;
     this->getNext()->finish();
 }
diff --git a/libqpdf/QPDFWriter.cc b/libqpdf/QPDFWriter.cc
index 30ba6f1f..71c48333 100644
--- a/libqpdf/QPDFWriter.cc
+++ b/libqpdf/QPDFWriter.cc
@@ -75,10 +75,7 @@ QPDFWriter::Members::~Members()
     {
 	fclose(file);
     }
-    if (output_buffer)
-    {
-	delete output_buffer;
-    }
+    delete output_buffer;
 }
 
 QPDFWriter::QPDFWriter(QPDF& pdf) :