diff --git a/Packages/MIES/MIES_WaveBuilder.ipf b/Packages/MIES/MIES_WaveBuilder.ipf
index 42682801b3..fb9f88ca80 100644
--- a/Packages/MIES/MIES_WaveBuilder.ipf
+++ b/Packages/MIES/MIES_WaveBuilder.ipf
@@ -2755,7 +2755,7 @@ Function WB_SplitStimsetName(string setName, string &setPrefix, variable &stimul
 	setPrefix    = ""
 	stimulusType = CHANNEL_TYPE_UNKNOWN
 
-	SplitString/E="(.*)_(DA|TTL)_([[:digit:]]+)" setName, setPrefixString, stimulusTypeString, setNumberString
+	SplitString/E="(?i)(.*)_(DA|TTL)_([[:digit:]]+)" setName, setPrefixString, stimulusTypeString, setNumberString
 
 	if(V_flag != 3)
 		return NaN
diff --git a/Packages/tests/Basic/UTF_Utils.ipf b/Packages/tests/Basic/UTF_Utils.ipf
index 40e7e9c7b6..be51e95d90 100644
--- a/Packages/tests/Basic/UTF_Utils.ipf
+++ b/Packages/tests/Basic/UTF_Utils.ipf
@@ -7692,3 +7692,20 @@ static Function TestAreIntervalsIntersecting()
 	Make/FREE data = {{-inf, 3}, {2, inf}}
 	CHECK(!AreIntervalsIntersecting(data))
 End
+
+static Function TestCaseInsensitivityWB_SplitStimsetName()
+
+	string setPrefix
+	variable stimulusType
+	variable setNumber
+
+	WB_SplitStimsetName("formula_DA_0", setPrefix, stimulusType, setNumber)
+	CHECK_EQUAL_STR(setPrefix, "formula")
+	CHECK_EQUAL_VAR(stimulusType, CHANNEL_TYPE_DAC)
+	CHECK_EQUAL_VAR(setNumber, 0)
+
+	WB_SplitStimsetName("formula_da_0", setPrefix, stimulusType, setNumber)
+	CHECK_EQUAL_STR(setPrefix, "formula")
+	CHECK_EQUAL_VAR(stimulusType, CHANNEL_TYPE_DAC)
+	CHECK_EQUAL_VAR(setNumber, 0)
+End