--- a/dom/canvas/WebGLTextureUpload.cpp
+++ b/dom/canvas/WebGLTextureUpload.cpp
@@ -1721,17 +1721,17 @@ WebGLTexture::ValidateCopyTexImageForFee
 }
 
 // There is no CopyTexImage3D.
 void
 WebGLTexture::CopyTexImage2D(TexImageTarget target, GLint level, GLenum internalFormat,
                              GLint x, GLint y, GLsizei width, GLsizei height,
                              GLint border)
 {
-    const char funcName[] = "CopyTexImage2D";
+    const char funcName[] = "copyTexImage2D";
 
     const uint8_t depth = 1;
 
     ////////////////////////////////////
     // Get dest info
 
     WebGLTexture::ImageInfo* imageInfo;
     if (!ValidateTexImageSpecification(funcName, target, level, width, height, depth,