diff --git a/src/libs/timeline/qml/notes.frag b/src/libs/timeline/qml/notes.frag
index 472c0174db0..72ecfa93718 100644
--- a/src/libs/timeline/qml/notes.frag
+++ b/src/libs/timeline/qml/notes.frag
@@ -28,8 +28,8 @@
 **
 ****************************************************************************/
 
-vec4 orange = vec4(1.0, 165.0 / 255.0, 0.0, 1.0);
-varying float d;
+lowp vec4 orange = vec4(1.0, 165.0 / 255.0, 0.0, 1.0);
+varying lowp float d;
 
 void main()
 {
diff --git a/src/libs/timeline/qml/timelineitems.frag b/src/libs/timeline/qml/timelineitems.frag
index 0ee0ad2aba6..5f44fbcf019 100644
--- a/src/libs/timeline/qml/timelineitems.frag
+++ b/src/libs/timeline/qml/timelineitems.frag
@@ -28,17 +28,22 @@
 **
 ****************************************************************************/
 
+#ifdef GL_OES_standard_derivatives
+#extension GL_OES_standard_derivatives : enable
+// else we probably have fwidth() in core
+#endif
+
 varying lowp vec3 edgeColor;
 varying lowp vec3 color;
 varying lowp vec2 barycentric;
 
-vec4 zero = vec4(0.0);
+lowp vec4 zero = vec4(0.0);
 void main()
 {
-    vec2 d = fwidth(barycentric) * 5.0;
-    vec4 edge_closeness = smoothstep(zero, vec4(d.x, d.y, d.x, d.y),
+    lowp vec2 d = fwidth(barycentric) * 5.0;
+    lowp vec4 edge_closeness = smoothstep(zero, vec4(d.x, d.y, d.x, d.y),
             vec4(barycentric.x, barycentric.y, 1.0 - barycentric.x, 1.0 - barycentric.y));
-    float total = min(min(edge_closeness[0], edge_closeness[1]),
+    lowp float total = min(min(edge_closeness[0], edge_closeness[1]),
             min(edge_closeness[2], edge_closeness[3]));
     // square to make lines sharper
     total = total > 0.5 ? (1.0 - (1.0 - total) * (1.0 - total) * 2.0) : total * total * 2.0;
diff --git a/src/libs/timeline/qml/timelineitems.vert b/src/libs/timeline/qml/timelineitems.vert
index 58f28b558a9..cea5b49cd42 100644
--- a/src/libs/timeline/qml/timelineitems.vert
+++ b/src/libs/timeline/qml/timelineitems.vert
@@ -47,13 +47,13 @@ void main()
     gl_Position = matrix * vertexCoord;
 
     // Make very narrow events somewhat wider so that they don't collapse into 0 pixels
-    highp float scaledWidth = scale.x * rectSize.x;
-    highp float shift = sign(scaledWidth) * max(0, 3.0 - abs(scaledWidth)) * 0.0005;
+    float scaledWidth = scale.x * rectSize.x;
+    float shift = sign(scaledWidth) * max(0.0, 3.0 - abs(scaledWidth)) * 0.0005;
     gl_Position.x += shift;
 
     // Ditto for events with very small height
-    highp float scaledHeight = scale.y * rectSize.y;
-    gl_Position.y += float(rectSize.y > 0.0) * max(0, 3.0 - scaledHeight) * 0.003;
+    float scaledHeight = scale.y * rectSize.y;
+    gl_Position.y += float(rectSize.y > 0.0) * max(0.0, 3.0 - scaledHeight) * 0.003;
 
     barycentric = vec2(rectSize.x > 0.0 ? 1.0 : 0.0, rectSize.y > 0.0 ? 1.0 : 0.0);
     color = vertexColor.rgb;
diff --git a/src/plugins/qmlprofiler/qml/bindingloops.frag b/src/plugins/qmlprofiler/qml/bindingloops.frag
index 8f364adea43..135252ea9d7 100644
--- a/src/plugins/qmlprofiler/qml/bindingloops.frag
+++ b/src/plugins/qmlprofiler/qml/bindingloops.frag
@@ -28,7 +28,7 @@
 **
 ****************************************************************************/
 
-vec4 orange = vec4(1.0, 165.0 / 255.0, 0.0, 1.0);
+lowp vec4 orange = vec4(1.0, 165.0 / 255.0, 0.0, 1.0);
 void main()
 {
     gl_FragColor = orange;