diff --git a/example/example_ppm1.f90 b/example/example_ppm1.f90
index 31b61c484..18e1f2cfc 100644
--- a/example/example_ppm1.f90
+++ b/example/example_ppm1.f90
@@ -15,7 +15,7 @@ program example_ppm1
     type(colormap)           :: cmap
     integer(ik), allocatable :: px(:, :)
     real(rk), allocatable    :: Xg(:,:), z_values(:)
-    real(rk)                 :: z, center(3), inner_radius, outer_radius, aspect_ratio
+    real(rk)                 :: center(3), inner_radius, outer_radius, aspect_ratio
     integer                  :: height, width, ng(2), red, green, blue, res1, res2, i
     integer, allocatable     :: idx(:,:)
     type(timer)              :: t
diff --git a/example/example_ppm2.f90 b/example/example_ppm2.f90
index 81ed0148f..f8a02978d 100644
--- a/example/example_ppm2.f90
+++ b/example/example_ppm2.f90
@@ -15,7 +15,7 @@ program example_ppm2
     type(colormap)           :: cmap
     integer(ik), allocatable :: px(:, :)
     real(rk), allocatable    :: Xg(:,:), z_values(:)
-    real(rk)                 :: z, center(3), inner_radius, outer_radius, aspect_ratio
+    real(rk)                 :: center(3), inner_radius, outer_radius, aspect_ratio
     integer                  :: height, width, ng(2), red, green, blue, res1, res2, i
     integer, allocatable     :: idx(:,:)
     type(timer)              :: t