diff --git a/hydrolib/core/dflowfm/bc/models.py b/hydrolib/core/dflowfm/bc/models.py
index 40fc942b0..5470b306d 100644
--- a/hydrolib/core/dflowfm/bc/models.py
+++ b/hydrolib/core/dflowfm/bc/models.py
@@ -77,10 +77,10 @@ class TimeInterpolation(StrEnum):
     linear = "linear"
     """str: Linear interpolation between times."""
 
-    block_from = "blockFrom"
+    block_from = "block-From"
     """str: Equal to that at the start of the time interval (latest specified time value)."""
 
-    block_to = "blockTo"
+    block_to = "block-To"
     """str: Equal to that at the end of the time interval (upcoming specified time value)."""
 
 
diff --git a/tests/data/reference/bc/t3d_backwards_compatibility.bc b/tests/data/reference/bc/t3d_backwards_compatibility.bc
index 03d2bda96..fa6f23490 100644
--- a/tests/data/reference/bc/t3d_backwards_compatibility.bc
+++ b/tests/data/reference/bc/t3d_backwards_compatibility.bc
@@ -7,7 +7,7 @@ fileType    = boundConds
 [Forcing]
 name               = boundary_timeseries
 function           = timeseries
-Time Interpolation = blockTo
+Time Interpolation = block-To
 offset             = 1.23
 factor             = 2.34
 quantity           = time
diff --git a/tests/data/reference/bc/test.bc b/tests/data/reference/bc/test.bc
index d0026e1e9..a419eec83 100644
--- a/tests/data/reference/bc/test.bc
+++ b/tests/data/reference/bc/test.bc
@@ -7,7 +7,7 @@ fileType    = boundConds
 [Forcing]
 name              = boundary_timeseries
 function          = timeseries
-timeInterpolation = blockTo
+timeInterpolation = block-To
 offset            = 1.230
 factor            = 2.340
 quantity          = time