diff --git a/src/mesa/main/debug.c b/src/mesa/main/debug.c
index 0f94ac4d0e8..dcd35fd32b2 100644
--- a/src/mesa/main/debug.c
+++ b/src/mesa/main/debug.c
@@ -205,7 +205,8 @@ set_debug_flags(const char *str)
       { "flush", DEBUG_ALWAYS_FLUSH }, /* flush after each drawing command */
       { "incomplete_tex", DEBUG_INCOMPLETE_TEXTURE },
       { "incomplete_fbo", DEBUG_INCOMPLETE_FBO },
-      { "context", DEBUG_CONTEXT } /* force set GL_CONTEXT_FLAG_DEBUG_BIT flag */
+      { "context", DEBUG_CONTEXT }, /* force set GL_CONTEXT_FLAG_DEBUG_BIT flag */
+      { "fallback_tex", DEBUG_FALLBACK_TEXTURE },
    };
    GLuint i;
 
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 74c45221e7c..03a62ae4a91 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -3680,7 +3680,8 @@ enum _debug
    DEBUG_ALWAYS_FLUSH		= (1 << 1),
    DEBUG_INCOMPLETE_TEXTURE     = (1 << 2),
    DEBUG_INCOMPLETE_FBO         = (1 << 3),
-   DEBUG_CONTEXT                = (1 << 4)
+   DEBUG_CONTEXT                = (1 << 4),
+   DEBUG_FALLBACK_TEXTURE       = (1 << 5),
 };
 
 #ifdef __cplusplus
diff --git a/src/mesa/main/texstate.c b/src/mesa/main/texstate.c
index cee73edf273..9917d6730ad 100644
--- a/src/mesa/main/texstate.c
+++ b/src/mesa/main/texstate.c
@@ -704,6 +704,8 @@ update_single_program_texture(struct gl_context *ctx, struct gl_program *prog,
     * Mesa implements this by creating a hidden texture object with a pixel of
     * that value.
     */
+   if (MESA_DEBUG_FLAGS & DEBUG_FALLBACK_TEXTURE)
+      _mesa_debug(NULL, "Using fallback texture for target %u\n", target_index);
    texObj = _mesa_get_fallback_texture(ctx, target_index, !!(prog->ShadowSamplers & BITFIELD_BIT(unit)));
    assert(texObj);