diff --git a/code/renderergl2/glsl/lightall_fp.glsl b/code/renderergl2/glsl/lightall_fp.glsl
index a6a6f133..7d23b24d 100644
--- a/code/renderergl2/glsl/lightall_fp.glsl
+++ b/code/renderergl2/glsl/lightall_fp.glsl
@@ -89,6 +89,9 @@ float RayIntersectDisplaceMap(vec2 dp, vec2 ds, sampler2D normalMap)
 	// current size of search window
 	float size = 1.0 / float(linearSearchSteps);
 
+	// adjust position if offset above surface
+	dp -= ds * r_parallaxMapOffset;
+
 	// current depth position
 	float depth = 0.0;
 
@@ -142,6 +145,7 @@ float RayIntersectDisplaceMap(vec2 dp, vec2 ds, sampler2D normalMap)
 #endif
 
 	return bestDepth;
+	return bestDepth - r_parallaxMapOffset;
 }
 
 float LightRay(vec2 dp, vec2 ds, sampler2D normalMap)
diff --git a/code/renderergl2/tr_glsl.c b/code/renderergl2/tr_glsl.c
index 0d95d0df..86cca599 100644
--- a/code/renderergl2/tr_glsl.c
+++ b/code/renderergl2/tr_glsl.c
@@ -1125,6 +1125,8 @@ void GLSL_InitGPUShaders(void)
 
 					if (r_parallaxMapShadows->integer)
 						Q_strcat(extradefines, 1024, "#define USE_PARALLAXMAP_SHADOWS\n");
+
+					Q_strcat(extradefines, 1024, va("#define r_parallaxMapOffset %f\n", r_parallaxMapOffset->value));
 				}
 			}
 
diff --git a/code/renderergl2/tr_init.c b/code/renderergl2/tr_init.c
index 6e502f58..945aa02c 100644
--- a/code/renderergl2/tr_init.c
+++ b/code/renderergl2/tr_init.c
@@ -132,6 +132,7 @@ cvar_t  *r_normalMapping;
 cvar_t  *r_specularMapping;
 cvar_t  *r_deluxeMapping;
 cvar_t  *r_parallaxMapping;
+cvar_t  *r_parallaxMapOffset;
 cvar_t  *r_parallaxMapShadows;
 cvar_t  *r_cubeMapping;
 cvar_t  *r_cubemapSize;
@@ -1243,6 +1244,7 @@ void R_Register( void )
 	r_specularMapping = ri.Cvar_Get( "r_specularMapping", "1", CVAR_ARCHIVE | CVAR_LATCH );
 	r_deluxeMapping = ri.Cvar_Get( "r_deluxeMapping", "1", CVAR_ARCHIVE | CVAR_LATCH );
 	r_parallaxMapping = ri.Cvar_Get( "r_parallaxMapping", "0", CVAR_ARCHIVE | CVAR_LATCH );
+	r_parallaxMapOffset = ri.Cvar_Get( "r_parallaxMapOffset", "0", CVAR_ARCHIVE | CVAR_LATCH );
 	r_parallaxMapShadows = ri.Cvar_Get( "r_parallaxMapShadows", "0", CVAR_ARCHIVE | CVAR_LATCH );
 	r_cubeMapping = ri.Cvar_Get( "r_cubeMapping", "0", CVAR_ARCHIVE | CVAR_LATCH );
 	r_cubemapSize = ri.Cvar_Get( "r_cubemapSize", "128", CVAR_ARCHIVE | CVAR_LATCH );
diff --git a/code/renderergl2/tr_local.h b/code/renderergl2/tr_local.h
index 39f6f7a2..668dbbdd 100644
--- a/code/renderergl2/tr_local.h
+++ b/code/renderergl2/tr_local.h
@@ -1778,6 +1778,7 @@ extern  cvar_t  *r_normalMapping;
 extern  cvar_t  *r_specularMapping;
 extern  cvar_t  *r_deluxeMapping;
 extern  cvar_t  *r_parallaxMapping;
+extern  cvar_t  *r_parallaxMapOffset;
 extern  cvar_t  *r_parallaxMapShadows;
 extern  cvar_t  *r_cubeMapping;
 extern  cvar_t  *r_cubemapSize;
diff --git a/opengl2-readme.md b/opengl2-readme.md
index c1a031c7..ee85c02c 100644
--- a/opengl2-readme.md
+++ b/opengl2-readme.md
@@ -184,6 +184,11 @@ Cvars for advanced material usage:
                                      1 - Use parallax occlusion mapping.
                                      2 - Use relief mapping. (slower)
 
+*  `r_parallaxMapOffset`            - Set the parallax height offset.
+                                     0    - Values map to -255 - 0. (default)
+                                     0.5  - Values map to -127 - 127.
+                                     1.0  - Values map to 0 - 255.
+
 *  `r_parallaxMapShadows`           - Enable self-shadowing on parallax map
                                    supported materials.
                                      0 - No. (default)