diff --git a/binaries/data/mods/public/shaders/glsl/model_common.vs b/binaries/data/mods/public/shaders/glsl/model_common.vs
index 1d4a324d22..395080e8f4 100644
--- a/binaries/data/mods/public/shaders/glsl/model_common.vs
+++ b/binaries/data/mods/public/shaders/glsl/model_common.vs
@@ -1,9 +1,4 @@
-#if USE_GPU_SKINNING
-// Skinning requires GLSL 1.30 for ivec4 vertex attributes
-#version 130
-#else
 #version 120
-#endif
 
 uniform mat4 transform;
 uniform vec3 cameraPos;
@@ -60,7 +55,7 @@ attribute vec2 a_uv1;
   const int MAX_INFLUENCES = 4;
   const int MAX_BONES = 64;
   uniform mat4 skinBlendMatrices[MAX_BONES];
-  attribute ivec4 a_skinJoints;
+  attribute vec4 a_skinJoints;
   attribute vec4 a_skinWeights;
 #endif
 
@@ -78,7 +73,7 @@ void main()
     vec3 p = vec3(0.0);
     vec3 n = vec3(0.0);
     for (int i = 0; i < MAX_INFLUENCES; ++i) {
-      int joint = a_skinJoints[i];
+      int joint = int(a_skinJoints[i]);
       if (joint != 0xff) {
         mat4 m = skinBlendMatrices[joint];
         p += vec3(m * vec4(a_vertex, 1.0)) * a_skinWeights[i];
diff --git a/source/renderer/InstancingModelRenderer.cpp b/source/renderer/InstancingModelRenderer.cpp
index 06e4b670eb..e96c3491d5 100644
--- a/source/renderer/InstancingModelRenderer.cpp
+++ b/source/renderer/InstancingModelRenderer.cpp
@@ -346,7 +346,7 @@ void InstancingModelRenderer::PrepareModelDef(const CShaderProgramPtr& shader, i
 	// GPU skinning requires extra attributes to compute positions/normals
 	if (m->gpuSkinning)
 	{
-		shader->VertexAttribIPointer("a_skinJoints", 4, GL_UNSIGNED_BYTE, stride, base + m->imodeldef->m_BlendJoints.offset);
+		shader->VertexAttribPointer("a_skinJoints", 4, GL_UNSIGNED_BYTE, GL_FALSE, stride, base + m->imodeldef->m_BlendJoints.offset);
 		shader->VertexAttribPointer("a_skinWeights", 4, GL_UNSIGNED_BYTE, GL_TRUE, stride, base + m->imodeldef->m_BlendWeights.offset);
 	}