diff --git a/lib/fhir_models/r4/bootstrap/definitions.rb b/lib/fhir_models/r4/bootstrap/definitions.rb
index 05f79556..0d2aa819 100644
--- a/lib/fhir_models/r4/bootstrap/definitions.rb
+++ b/lib/fhir_models/r4/bootstrap/definitions.rb
@@ -3,7 +3,7 @@ module R4
     class Definitions
       include CommonDefinitions
       extend FHIR::R4
-      @ig_file_name = File.join(Dir.pwd, 'lib', 'fhir_models', 'igs', 'hl7.fhir.r4.core.tgz')
+      @ig_file_name = File.join(__dir__, '..', '..', 'igs', 'hl7.fhir.r4.core.tgz')
 
       load_igs(@ig_file_name)
     end
diff --git a/lib/fhir_models/r4b/bootstrap/definitions.rb b/lib/fhir_models/r4b/bootstrap/definitions.rb
index 28a2306e..4e3c6487 100644
--- a/lib/fhir_models/r4b/bootstrap/definitions.rb
+++ b/lib/fhir_models/r4b/bootstrap/definitions.rb
@@ -3,7 +3,7 @@ module R4B
     class Definitions
       include CommonDefinitions
       extend FHIR::R4B
-      @ig_file_name = File.join(Dir.pwd, 'lib', 'fhir_models', 'igs', 'hl7.fhir.r4b.core.tgz')
+      @ig_file_name = File.join(__dir__, '..', '..', 'igs', 'hl7.fhir.r4b.core.tgz')
 
       load_igs(@ig_file_name)
     end
diff --git a/lib/fhir_models/r5/bootstrap/definitions.rb b/lib/fhir_models/r5/bootstrap/definitions.rb
index 5f66897f..10c5b3a6 100644
--- a/lib/fhir_models/r5/bootstrap/definitions.rb
+++ b/lib/fhir_models/r5/bootstrap/definitions.rb
@@ -3,7 +3,7 @@ module R5
     class Definitions
       include CommonDefinitions
       extend FHIR::R5
-      @ig_file_name = File.join(Dir.pwd, 'lib', 'fhir_models', 'igs', 'hl7.fhir.r5.core.tgz')
+      @ig_file_name = File.join(__dir__, '..', '..', 'igs', 'hl7.fhir.r5.core.tgz')
 
       load_igs(@ig_file_name)
     end