diff --git a/src/mainboard/google/nyan/mainboard.c b/src/mainboard/google/nyan/mainboard.c
index 6e6c0cdf92..2120e8097a 100644
--- a/src/mainboard/google/nyan/mainboard.c
+++ b/src/mainboard/google/nyan/mainboard.c
@@ -81,10 +81,12 @@ static void setup_pinmux(void)
 			  PINMUX_GEN1_I2C_SDA_FUNC_I2C1 | PINMUX_INPUT_ENABLE);
 	// I2C2 clock.
 	pinmux_set_config(PINMUX_GEN2_I2C_SCL_INDEX,
-			  PINMUX_GEN2_I2C_SCL_FUNC_I2C2 | PINMUX_INPUT_ENABLE);
+			  PINMUX_GEN2_I2C_SCL_FUNC_I2C2 | PINMUX_INPUT_ENABLE |
+			  PINMUX_OPEN_DRAIN);
 	// I2C2 data.
 	pinmux_set_config(PINMUX_GEN2_I2C_SDA_INDEX,
-			  PINMUX_GEN2_I2C_SDA_FUNC_I2C2 | PINMUX_INPUT_ENABLE);
+			  PINMUX_GEN2_I2C_SDA_FUNC_I2C2 | PINMUX_INPUT_ENABLE |
+			  PINMUX_OPEN_DRAIN);
 	// I2C4 (DDC) clock.
 	pinmux_set_config(PINMUX_DDC_SCL_INDEX,
 			  PINMUX_DDC_SCL_FUNC_I2C4 | PINMUX_INPUT_ENABLE);
diff --git a/src/mainboard/google/nyan_big/mainboard.c b/src/mainboard/google/nyan_big/mainboard.c
index a6e83b911d..39f5291668 100644
--- a/src/mainboard/google/nyan_big/mainboard.c
+++ b/src/mainboard/google/nyan_big/mainboard.c
@@ -81,10 +81,12 @@ static void setup_pinmux(void)
 			  PINMUX_GEN1_I2C_SDA_FUNC_I2C1 | PINMUX_INPUT_ENABLE);
 	// I2C2 clock.
 	pinmux_set_config(PINMUX_GEN2_I2C_SCL_INDEX,
-			  PINMUX_GEN2_I2C_SCL_FUNC_I2C2 | PINMUX_INPUT_ENABLE);
+			  PINMUX_GEN2_I2C_SCL_FUNC_I2C2 | PINMUX_INPUT_ENABLE |
+			  PINMUX_OPEN_DRAIN);
 	// I2C2 data.
 	pinmux_set_config(PINMUX_GEN2_I2C_SDA_INDEX,
-			  PINMUX_GEN2_I2C_SDA_FUNC_I2C2 | PINMUX_INPUT_ENABLE);
+			  PINMUX_GEN2_I2C_SDA_FUNC_I2C2 | PINMUX_INPUT_ENABLE |
+			  PINMUX_OPEN_DRAIN);
 	// I2C4 (DDC) clock.
 	pinmux_set_config(PINMUX_DDC_SCL_INDEX,
 			  PINMUX_DDC_SCL_FUNC_I2C4 | PINMUX_INPUT_ENABLE);
diff --git a/src/mainboard/google/nyan_blaze/mainboard.c b/src/mainboard/google/nyan_blaze/mainboard.c
index 2f898141f3..4118ef2411 100644
--- a/src/mainboard/google/nyan_blaze/mainboard.c
+++ b/src/mainboard/google/nyan_blaze/mainboard.c
@@ -81,10 +81,12 @@ static void setup_pinmux(void)
 			  PINMUX_GEN1_I2C_SDA_FUNC_I2C1 | PINMUX_INPUT_ENABLE);
 	// I2C2 clock.
 	pinmux_set_config(PINMUX_GEN2_I2C_SCL_INDEX,
-			  PINMUX_GEN2_I2C_SCL_FUNC_I2C2 | PINMUX_INPUT_ENABLE);
+			  PINMUX_GEN2_I2C_SCL_FUNC_I2C2 | PINMUX_INPUT_ENABLE |
+			  PINMUX_OPEN_DRAIN);
 	// I2C2 data.
 	pinmux_set_config(PINMUX_GEN2_I2C_SDA_INDEX,
-			  PINMUX_GEN2_I2C_SDA_FUNC_I2C2 | PINMUX_INPUT_ENABLE);
+			  PINMUX_GEN2_I2C_SDA_FUNC_I2C2 | PINMUX_INPUT_ENABLE |
+			  PINMUX_OPEN_DRAIN);
 	// I2C4 (DDC) clock.
 	pinmux_set_config(PINMUX_DDC_SCL_INDEX,
 			  PINMUX_DDC_SCL_FUNC_I2C4 | PINMUX_INPUT_ENABLE);