diff --git a/src/agg/process_raster_symbolizer.cpp b/src/agg/process_raster_symbolizer.cpp
index cdc85c833..e27e47c00 100644
--- a/src/agg/process_raster_symbolizer.cpp
+++ b/src/agg/process_raster_symbolizer.cpp
@@ -108,10 +108,10 @@ void agg_renderer<T>::process(raster_symbolizer const& sym,
                 double image_ratio_x = ext.width() / source->data_.width();
                 double image_ratio_y = ext.height() / source->data_.height();
                 double eps = 1e-5;
-                if ( (std::fabs(image_ratio_x - 1) <= eps) &&
-                     (std::fabs(image_ratio_y - 1) <= eps) &&
-                     (std::fabs(start_x) <= eps) &&
-                     (std::fabs(start_y) <= eps) )
+                if ( (std::fabs(image_ratio_x - 1.0) <= eps) &&
+                     (std::fabs(image_ratio_y - 1.0) <= eps) &&
+                     (std::abs(start_x) <= eps) &&
+                     (std::abs(start_y) <= eps) )
                 {
                     composite(current_buffer_->data(), source->data_,
                               sym.comp_op(), sym.get_opacity(),
diff --git a/src/cairo_renderer.cpp b/src/cairo_renderer.cpp
index 0ae0c95c6..8ccd4ad41 100644
--- a/src/cairo_renderer.cpp
+++ b/src/cairo_renderer.cpp
@@ -939,10 +939,10 @@ void cairo_renderer_base::process(raster_symbolizer const& sym,
                 double image_ratio_x = ext.width() / source->data_.width();
                 double image_ratio_y = ext.height() / source->data_.height();
                 double eps = 1e-5;
-                if ( (std::fabs(image_ratio_x - 1) <= eps) &&
-                     (std::fabs(image_ratio_y - 1) <= eps) &&
-                     (std::fabs(start_x) <= eps) &&
-                     (std::fabs(start_y) <= eps) )
+                if ( (std::fabs(image_ratio_x - 1.0) <= eps) &&
+                     (std::fabs(image_ratio_y - 1.0) <= eps) &&
+                     (std::abs(start_x) <= eps) &&
+                     (std::abs(start_y) <= eps) )
                 {
                     cairo_save_restore guard(context_);
                     context_.set_operator(sym.comp_op());