diff --git a/libs/zita-resampler/vmresampler.cc b/libs/zita-resampler/vmresampler.cc
index ae9215ba0d..b7442c7d15 100644
--- a/libs/zita-resampler/vmresampler.cc
+++ b/libs/zita-resampler/vmresampler.cc
@@ -22,7 +22,6 @@
 #include <stdio.h>
 #include <string.h>
 #include <math.h>
-#include <assert.h>
 
 #include "zita-resampler/vmresampler.h"
 
@@ -166,7 +165,6 @@ VMResampler::process (void)
 	float          a, *p1, *p2;
 
 	if (!_table) return 1;
-	assert (inp_data != NULL && out_data != NULL);
 
 	const int hl = _table->_hl;
 	const unsigned int np = _table->_np;
diff --git a/libs/zita-resampler/wscript b/libs/zita-resampler/wscript
index 83316b1a83..91edc4f9ab 100644
--- a/libs/zita-resampler/wscript
+++ b/libs/zita-resampler/wscript
@@ -48,8 +48,7 @@ def build(bld):
         return
 
     obj = bld.stlib(features = 'cxx cxxstlib', source = zresampler_sources)
-    obj.cxxflags        = [ '-fPIC' ]
-    obj.cflags          = [ '-fPIC' ]
+    obj.cxxflags        = [ '-fPIC', '-O3', '-ffast-math' ]
     obj.export_includes = ['.']
     obj.includes        = ['.']
     obj.name            = 'zita-resampler'