diff --git a/thirdparty/README.md b/thirdparty/README.md
index 67533788bb5f..ed8eb9f48f8e 100644
--- a/thirdparty/README.md
+++ b/thirdparty/README.md
@@ -118,7 +118,7 @@ will limit its functionality to IPv4 only.
 ## etcpak
 
 - Upstream: https://github.com/wolfpld/etcpak
-- Version: 1.0 (a77d5a37ddf48034cee8aeb9e8792a623c265b4c, 2022)
+- Version: 1.0 (153f0e04a18b93c277684b577365210adcf8e11c, 2022)
 - License: BSD-3-Clause
 
 Files extracted from upstream source:
diff --git a/thirdparty/etcpak/ProcessRGB.cpp b/thirdparty/etcpak/ProcessRGB.cpp
index fdb0967ce76a..4dc3bf23af21 100644
--- a/thirdparty/etcpak/ProcessRGB.cpp
+++ b/thirdparty/etcpak/ProcessRGB.cpp
@@ -3216,9 +3216,9 @@ etcpak_force_inline static uint16x8_t ErrorProbe_EAC_NEON( uint8x8_t recVal, uin
     uint8x8_t srcValWide;
 #ifndef __aarch64__
     if( Index < 8 )
-        srcValWide = vdup_lane_u8( vget_low_u8( alphaBlock ), ClampConstant( Index, 0, 8 ) );
+        srcValWide = vdup_lane_u8( vget_low_u8( alphaBlock ), ClampConstant( Index, 0, 7 ) );
     else
-        srcValWide = vdup_lane_u8( vget_high_u8( alphaBlock ), ClampConstant( Index - 8, 0, 8 ) );
+        srcValWide = vdup_lane_u8( vget_high_u8( alphaBlock ), ClampConstant( Index - 8, 0, 7 ) );
 #else
     srcValWide = vdup_laneq_u8( alphaBlock, Index );
 #endif
@@ -3256,9 +3256,9 @@ etcpak_force_inline static int16x8_t WidenMultiplier_EAC_NEON( int16x8_t multipl
     constexpr int Lane = GetMulSel( Index );
 #ifndef __aarch64__
     if( Lane < 4 )
-        return vdupq_lane_s16( vget_low_s16( multipliers ), ClampConstant( Lane, 0, 4 ) );
+        return vdupq_lane_s16( vget_low_s16( multipliers ), ClampConstant( Lane, 0, 3 ) );
     else
-        return vdupq_lane_s16( vget_high_s16( multipliers ), ClampConstant( Lane - 4, 0, 4 ) );
+        return vdupq_lane_s16( vget_high_s16( multipliers ), ClampConstant( Lane - 4, 0, 3 ) );
 #else
     return vdupq_laneq_s16( multipliers, Lane );
 #endif